# The probability of an event happening is the ratio of the number of?

# What is the probability of an event occurring to the probability that it will not occur?

The probability that an event will occur plus the probability that it will not occur equals 1.

# How do you apply ratios to probability?

Ratios and probability Perhaps this question is best answered with examples right off the bat. Let's say you have two regular fair dice (six-sided, of course). If you throw them 360 times and keep track of the numbers you throw, you'll record a seven about 60 times. So, you could say that the ratio… of all possible numbers (including sevens) to sevens to is 360 to 36 (360:60), which is the same as 6 to 1 (6:1). You could also say that the ratio of all OTHER numbers (excluding sevens) to sevens to is 300:60, or 5:1. (there is no seven on a six sided die....) You would have also recorded about 50 occurrences of sixes, so you could say that the ratio of sevens to sixes is 60 to 50, or 6 to 5 (6:5). Obviously, the ratio of sixes to sevens would be 5:6. How about this: Let's say that the probability that a certain type of rare snake will have male offspring is 0.4. Obviously, the probability of the snake's having female offspring is 0.6. If the snake has lots of offspring, the ratio of males to females will be 0.4 to 0.6, which is the same as 4 to 6, which is the same as 2 to 3 (2:3). Stated another way, for every five snakes born, two will be male, and three will be female. By the way, whenever possible, it's a good idea to express ratios as close as you can to whole numbers, like 3:2 or 7:5. Also, whenever one of the digits is a one, it's particularly useful, like 3:1 or 9:1, or even 1.5:1. That last ratio, 1.5:1, is equal to 3:2. It depends on what you're more comfortable with. (MORE)

# What is probability ratio?

If the outcomes of a trial or experiment are all equally likely then the probability ratio for a specific event is the ratio of the number of outcomes that are favourable to the event divided by the total number of possible outcomes.

# What is the probability of an event occurring to the probability that will not occur?

If the event in question is A and the probability of A occurring is P(A), then the probability of A not occurring is P(A')=1-P(A).

# What is the probability of two events happening together when on their own the first event happens 75 and the second event happens 50?

If the two events are independent then the probability of them both happening is Pr(event1) X Pr(event2). Which in your case is 0.75x0.50=0.375 which translates into 37.5%

# How do you find the probability of an event?

There are two main methods: the empirical method and the theoretical method. Suppose you want the probability of throwing a 6 on one roll of a die. Empirical method: Throw the die lots and lots of times and count the total number of throws as well as the number of throws that result in a 6. The pr…obability of throwing a six is the number of times you get a 6 divided by the total number of throws. Theoretical method: A die is a cube with six equal faces. Assuming the die is fair, each face has an equal probability of turning up. There are no other outcomes possible (the probability of the die ending up on an edge or a vertex are assumed to be zero). So, there are six outcome, and each equally probable, so that each has a probability of 1/6. (MORE)

# How are genetic events related to probability?

Everything that makes you, you came from genes. When you get genes passed on to you from mother and father, there are different combinations you could get. You can measure the chances (or probability) of who gets what traits (genes) from the parents by using the method of creating a punnet square.

# If an event is unlikely to happen its probability is?

If the even is never going to take place, and it is for sure, then it's probability will be 0. For example, if the event is : A child being born with powers like Superman. For this event, the probability would be 0! But in practicality, if the event is unlikely to happen, it's probability is likel…y to be nearer to 0. Keeping in mind the difference between "unlikely to happen" and "never going to happen for sure". Because there is a possibility that the event that is unlikely to happen may just happen once in a thousand years. So in this case, the probability will be very very close to 0, but it will not be 0 exactly. (MORE)

# What is the ratio of the number of ways an event can occur to the number of possible outcomes?

The term is probability ( theoretical probability ), or how likely a given event is to occur.

# If the probability of an event is 0.42 then what is the probability of its component?

I haven't heard of a component with regards to statistics. If, by chance, you are referring to the complement, it is the probability that the event does not occur. In this case, the complement would be 0.58.

# Probability can be defined as a ratio between the number of and number of possible outcomes?

yes it can be defined more commonly as a ratio between the number of and numbr of possible outcomes

# If the probabilty that an event will happen is 3 what is the probability of the event complement?

The probability of event X is 0.3. If events X and Y are complements, what is the probability of event Y?

# Probablity of an event occurring to the probablity that it will not occor?

Let p = probability the event will occur; and q = probability the event will not occur. The relationship is p=1-q or q=1-p.

# The ratio of the probability that an event will occur compared with the probability of its not occurring?

odds "The odds against an event is a ratio of the probability that the event will fail to occur (failure) to the probability that the event will occur (success). To find odds you must first know or determine the probability of success and the probability of failure. Odds against event = P(even…t fails to occur)/P(event occurs) = P(failure)/P(success) .
The odds in favor of an event are expressed as a ratio of the probability that the event will occur to the probability that the event will fail to occur. Odds in favor of event = P(event occurs)/ P(event fails to occur) = P(success)/P(failure)" Allen R. Angel, Christine D. Abbott, Dennis C. Runde. A Survey of Mathematics with Applications. Pearson Custom Publishing 2009. Pages 286-288. (MORE)

# Two events A and B with probability 0.5 and 0.7 respectively have joint probability of 0.4 The probability that neither A nor B happens is?

Let me denote -A as the event that A does not happen. So we want Pr[-(A and B)] Now, the event that neither A nor B occurs is the opposite of either A occurring, or B occurring or both occurring. So Pr[-(A and B)] = 1 - Pr(A or B) = 1 - [Pr(A) + Pr(B) - Pr(A and B)] (since A+B is double counted)=… 1 - (0.5 + 0.7 - 0.4)= 1 - 0.8= 0.2 . (MORE)

# What is the ratio of the number of equally likely outcomes in an event to the total number of possible outcomes?

You find the total number of outcomes by adding the first part of the odds to the second part of the odds. For example: 1:1 The total number of outcomes would be 2. To find the ratio of equally likely outcomes to the total number, find the number of outcomes, and put it on the left of the semicolon…. Then put the total number on the right side. For the same example: (outcomes)->1:2 (MORE)

# What are equally likely events event in probability?

If there are two possible outcomes, the probability would be 50% or 1/2 (AN EVEN CHANCE). "Equally likely events" refers to the chances of each possible outcome among many being equal. For example, using a six-sided die in a dice game yields a 1/6 chance for any one of the numbers to appear on top o…f the cube. Assuming that the die is not loaded, all six numbers are presumed to have an equal likelihood to end up on top in a given throw. (MORE)

# Describe an event that has a probability of 1 and an event that has a probability of 0?

P(a^~a)1 P(a&~a)0 the line above is shorthand notation for an event that has a probability of 1, followed by an event that has a probability of 0. P(event) is an easy way to say the probability of "event". The "^" means "OR", the "~" means "NOT", and the "&" as you are probably familiar means "AND…". So puting it together, "P(a^~a)" means the probability that an event "a" occurs OR that event "a" does not occur. So take an event "a", any event, like drawing an 8 of clubs out of a deck of cards. If you draw a random card out of a deck of cards, the probability that you will draw an 8 of clubs OR that you will not draw an 8 of clubs is 1. That means 100%. So when you draw a card you will either draw the 8 of clubs or not draw the 8 of clubs. It seems like an obvious statement to make but its a proof that becomes very important in proving less obvious theories. likewise, the second statement was "P(a&~a)", so the probability that event "a" occurs AND event "a" doesnt occur. Since the event has to either occur or not, it cant occur AND not occur, so the probability is 0. (MORE)

# A spinner with 10 equal sectors numbered 1 through 10 is spunFind the probability of each eventWrite your answer as a ratio as a decimal and as a percent?

There are ten possible events: that the spinner shows one of the number from 1 to 10. The probability of each of these events is the same and equals 1/10, 0.1 or 10%

# Find the probability of each event when two fair number cubes are rolled?

The probability that any number will come up on one cube is 1/6. 1/6*1/6=1/36 the probability is 1/36

# What is the probability of an event not occurring?

The probability of an event not occurring is 1 minus the probability of it occurring.

# Which of the following cannot be the probability of an event?

There is insufficient information in the question to properly answer it. You did not provide the list of "the following". Please restate the question. However, by definition of probability, a probability less than 0 (the event will never happen) or greater than 1 (the event will always happen) is… impossible, so maybe that answers your question. (MORE)

# The odds in favor of an event are 10 to1 ratio Find the probability that the event will occur?

If the odd favoring an event are 10 to 1, then the probability of the event occurring is 0.9. The odds in favor of an event are 10:1. Find the probability that the event will occur. ---- P(E)+P(E') = 1 --- P(E)/P(E') = 10/1 So P(E) = 10P(E') ---- Substitute for P(E) and solve for P(…E'): 10P(E')+P(E') = 1 11P(E') = 1 P(E') = 1/11 --- Therefore P(E) = 10/11 (MORE)

# What is a probability of an event?

Lets first start by defining some terms: Probability (P) in statistics is defined as the chance of an event occurring. Probability experiment is a chance process that leads to results called outcomes. An outcome is the result of a single trial of a probability experiment. A sample se…t is the set of all possible outcomes of a probability experiment. An event consists of a set of outcomes of a probability experiment. An event can be one outcome or more than one outcome. The event can be anything from flipping a coin, to rolling a die, to picking a card. The probability of any event (E) is: (# of outcomes in E) / (total # of outcomes in sample space) For example: Find the probability a die is rolled and you get a 4? We know that there are 6 possibilities when rolling a die. We can either rolled a 1, or a 2, or a 3, or a 4, or a 5, or a 6. Using the equation above: P(rolling a 4)= 1/6 The event in this case is rolling a 4. (MORE)

# When a Die is thrown then the probability of an event getting out-comes is not a prime number is what?

When a Die is thrown then the probability of an event getting out-comes is not a prime number is 3/6. The possible prime numbers would be 2, 3, or 5. The possible outcomes are 1, 2,3,4,5 and 6. So 1,4 and 6 are not primes and there are 3 numbers out of 6 possible so that is 3/6 or p=.5

# What is the probability that the event will not happen if the probability of an event is 75 percent?

let event is X so P(X)=75%=0.75 probabilty that event will not happen P(X')=1-P(X) P(X')=1-0.75 P(X')=0.25 so probabilty that event will not happen is 0.25

# What must you do to determine the probability of multiple independent events happening a certain way?

Divide the number of events that can happen a certain way by the number of all possible events.

# What event has a probability of 0?

-- The freezing over of Hell. -- A confirmed sighting of flying pigs. etc. Besides anything that is impossible, as noted above, the simultaneous occurrence of two mutually exclusive events has a probability of zero: It is raining and it is not raining, it is on and it is off, etc.

# What happens to experimental probability as the number of trials increases?

The probability from experimental outcomes will approach theoretical probability as the number of trials increases. See related question about 43 out of 53 for a theoretical probability of 0.50

# What must happen for the probability of an event to be 1?

Saying the probability of an event simply means that event is certain. e.g the probability that the sun will set today is1. so nothing must really happen but the event has to be a certain one.

# Who said the probability of any event is 50-50 since either it will happen or it won't?

If an event has only two possible outcomes (will happen or it wont, like in heads/tails of a coin toss) then the probability of either even is 50% Blaise Pascal and Pierre de Fermat discovered almost all of probability , maybe one of them said it....

# What operation is used when calculating the probability that 2 events will happen and Find the theoretical probability of rolling a total of 7 as a sum of two dices?

If the two events are unrelated, as they are in rolling two dice or one die twice, simply multiply the probabilities together. However, you also have to consider the permutations involved in rolling dice and realize that there is more than one way to roll a particular sum. There are 36 permutatio…ns of rolling two dice. Of these, exactly one has a sum of two, the the probability of rolling a sum of two is 1 in 36, or about 0.02778. You simply multiply 1 in 6 by 1 in 6, getting 1 in 36. In the case of rolling a sum of seven, there are exactly six permutations, 1+6, 2+5, 3+4, 4+3, 5+2, and 6+1, so the probability of rolling a sum of seven is 6 in 36, or 1 in 6, or about 0.1667. Another example is rolling pairs, such as two's or three's. The probability of rolling "something" on one die is 1 in 1, while the probability of matching it on the second die is 1 in 6, so you multiply (1 in 1) by (1 in 6) to get a probability of rolling a pair of 1 in 6, or about 0.1667. More useful towards understanding this concept is a deck of 52 cards. The probability of drawing an Ace is 4 in 52, or 1 in 13, or about 0.07692. The probability of drawing two Ace's is (4 in 52) times (3 in 51), or 12 in 2652, or 1 in 221, or about 0.004525. In this case, the two events are related, because the occurrence of the first event affects the probability of the second event, so you need to consider the calculation carefully. (MORE)

# How are ratio and probability the same?

A ratio is a comparison of the relative size of two different things. Probability is the change that something will (or will not) occur. Probability can be expressed as a ratio of Yes to No (or, "will occur" to "won't occur"). That is, Probability is the relative size of Yes to No. So, if somethi…ng is said to have a 60% Probability of occurring, what that is indicating is that, out of 100 tries, 60 will be the outcome indicated. While probability is usually expressed as a percentage, it is entirely possible to express it as a ratio. In the aforementioned example, a 60% Probability of occurrence could also be said to be a 60:40 (or, reduced, 3:2) ratio in favor of happening. (MORE)

# What is probablity ratio?

what something is out of for example, there are the 3 blue marbles and 1 green marble in a bag. what is the probability of someone picking out a blue marble. answer is 3 of 4

# What approach to probability is based on a persons degree of belief and hunches that a particular event will happen?

Subjective If you assume particular events will happen with a certain prior distribution, that is Bayesian probability.

# What is the difference between ratio and probability?

A ratio tends to be a fix number that identifies an amount of one part that makes an amount of a secondary part. Where as a probability can change if the input changes. Example: 3:5 says that for every 3 parts there will be 5 parts of something else, this ratio cannot change unless we add anot…her factor. However, a probably can change based solely on rolling of a dice again. . (MORE)

# What actually happens in probability is what probability?

It is experimental probability. It is experimental probability. It is experimental probability. It is experimental probability. It is experimental probability. It is experimental probability. It is experimental probability. It is experimental probability. It is experimental probability. It …is experimental probability. It is experimental probability. (MORE)

# How do you compute the probability of an event?

There are two main ways: One is to calculate the theoretical probability. You will need to develop a model for the experiment and then use the laws of science and mathematics to determine the probability of the event (subject to the model's assumptions). A major alternative is the empirical or ex…perimental method. This requires performing the trial many times. The probability of the event is estimated by the proportion of the total number of trials which result in the outcome of interest occurring. (MORE)

# What happens to theoretical and experimental probability when you increase the number of trials?

When you increase the number of trials of an aleatory experiment, the experimental probability that is based on the number of trials will approach the theoretical probability.

# Can probability of an event be negative?

An event will happen or not so its probabilty is between 0 (never happen) and 1 (will surely happen). The probability is a measure of its chance to happen. A negative probability would have no sense. You can think about probabilty this way: imagine a 1-litre bottle, it can be empty (0 litre…) or full (1 litre) and any value between 0 and 1 but the value can't be negative. (MORE)

# What is event whose probability is 1 because it happens every time?

The probability that a person will die is 1. The probability is 1 that you will pick a club if all the spades, hearts and diamonds are removed from a 52-card deck.

# What happens if you divide or multiply a ratio by different numbers?

If you mean multiplying numerator and denominator by different numbers, the result is then a different ratio. If you mean variously multiplying the numerator and denominator by the same number on different occasions, the result is unchanged.

# What is the probability that an event will happen?

It is a measure of the likelihood of that event occurring, as a proportion of all possible outcomes.

# What in an event is the ratio of the number of favorable outcomes to the number of possible outcomes?

That's the 'probability' of a favorable outcome. .
but only if the outcomes are equally likely..

# Is the probability always expressed as a ratio?

Yes, provided you consider fractions and percentages as ratios. Yes, provided you consider fractions and percentages as ratios. Yes, provided you consider fractions and percentages as ratios. Yes, provided you consider fractions and percentages as ratios.

# What does the probability of a independent event that is likely to happen?

It is a real number between 0.5 and 1. Whether or not it is independent makes no difference to this answer.

# What is the probability of a independent event is going to happen?

If it's an independent event then it's probability does not depend on preceding events. For example, if I flip a coin twice the probability that the coin will show 'heads' the second time is independent of what happened the first time; it's just 1/2.

# Why is the probability of an event always a number between 0 and 1?

The probability of an event is defined as the ratio of favourable outcomes to total outcomes. In the case of discrete distributions these will be represented by numbers, while for continuous distribution they will be measured as areas. In either case, the first measure is non-negative and the secon…d is positive and so the probability is greater than 0. Also, the number of favourable outcomes cannot be greater than the total so the probability must be at most 1. (MORE)

# What is a different event that is the same as what is the probability that if you roll the dice you'll get the number 3?

What is the probability that the letter P is picked when a letteris picked at random from the word STUPID!

# If the probability that an event will happen is .25 or 25 percent what is the probability that it will not happen?

The total probability of something happening plus the probabilityof that same thing not happening is 1, or 100 % â probability of not happening = 1 - 0.25 = 0.75 or 100 % - 25 % =75 %