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Probability

The probability of a certain event is a number expressing the likelihood that a specific event will occur, expressed as the ratio of the number of actual occurrences to the number of possible occurrences. In mathematics, it is a measure of how often an event will happen and is the basis of statistics.

14,643 Questions

A multiple choice question has 5 choices if you gets 2 questions what is the probability of getting both correct?

Well they are independent events so it is the probability of getting a correct answer multiplied by the probability of getting a correct answer on the second question.

Short Answer: 1/5 times 1/5=1/25

How many people around the world share the same birthday as you?

A person shares their birthday with at least nine million different people around the world.

The probability of rolling an even number when number cube is rolled twice?

Because 3/6 of the sides on a number cube have even numbers, the probability of rolling even on one number cube is 1/2(equivalent of 3/6). But since you're rolling twice, you multiply the probability of one by itself (therefore rolling 2 number cubes). So:

1/2x1/2=1/4

The probability of rolling an even number when a number cube is rolled twice is 1/4, 25%, or 1 out of 4.

You roll 2 dice What is the probability that the sum of the dice is greater than 6 and 1 die shows a 2?

well lets do the math.

1 dice has a 6:1 odd of getting each number. lets say we get a 2 so that was 6:1. the dice you can get for higher than 6 are

1 6

2 5

3 4

4 3

5 2

6 1

each has a 12:1 chance. the dice that meet the condtion are 2 5 and 5 2 so 12:2 or 6:1

Can a coin land an its side?

For this answer we must leave Answers.com and travel through another dimension -- a dimension not only of sight and sound but of mind. A journey into a wondrous land whose boundaries are that of imagination. That's a signpost up ahead: your next stop: the Twilight Zone!

The episode was called "A Penny for Your Thoughts" (Season 2, episode 25 staring Dick York)

The Opening narration of that episode goes as follows:

Mr. Hector B. Poole, resident of the Twilight Zone. Flip a coin and keep flipping it. What are the odds? Half the time it will come up heads, half the time tails. But in one freakish chance in a million, it'll land on its edge. Mr. Hector B. Poole, a bright human coin, on his way to the bank.

The man flips a coin, it lands on edge, and he discovers that he's mysteriously become telepathic. At the end of the episode, he knocks the coin over and the telepathy goes away.

In reality, mathematicians have tried to figure this out as have physicists. The answer depends on the exact size and width of the edge of the penny, and many other factors. One this is for sure, Rod Serling was not far off when he guessed one in a million.

Nickels have a larger chance of landing on their edge since they have a larger edge and probability of an American nickel landing on edge is approximately 1 in 6000 tosses by one source. The work is not all shown and I don't believe it has been duplicated.

So I don't think there is an exact answer to your question, but the probability certainly is somewhere between 0 and a number very close to 0. It is statistically insignificant.

I now return you to an area we call Answers. com|WikiAnswers.

In a bag there are 4 red marbles 5 white marbles and 6 blue marbles once a marble is selected it is not replaced what are the odds of pulling a red marble than a white marble?

The odds of pulling a red marble on the first try is 4/15 or about .27 and the probability of drawing a white marble the second time if a the first is a red marble is 5/14 or about .36. the odds of both happening is the product of the probabilities of the other events, or 2/21.

What is the expected value of the standard normal distribution equal to?

The expected value of the standard normal distribution is equal to the total amount of the value. It is usually equal to it when the value works out to be the same.

What is probability that you pick 3 white balls if you have 3 white balls 1 red ball and 2 green balls?

The probability that you pick 3 white balls is 0.05 or 5%.

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EXPLANATION
The probability of first drawing a white ball is: P(W1) =

3/6.

The probability of drawing a white ball given the event that you already draw a

white ball in the first draw and not replacing it back is: P(W2│W1) =

2/5.

The probability of drawing a white ball on the third draw given the event that a

white ball was drawn in the first and in the second draw is: P(W3│(W

1UW2)) =

1/4

Now, the probability of drawing 3 white balls one by one with out replacement

(taking all 3 balls at a time gets the same analysis and result) is:

P(W1UW2UW3) =

P(W1)∙P(W

2│W1)∙P(W

3│(W

1UW2)) =

(3/6)∙(2/5)∙(1/4) =

1/20

=

0.05 =

5%.

Two coins are tossed what is the probability of getting no head?

lets get some facts

odds of head on 1 coin 50% or evens

odds of no head 50% or evens

the possible results vary from 1 coin to 2 coins.

1 coin has 2 results heads or tails

2 coins have 4 results. heads heads, tails tails, tails heads, heads tails. each outcome has a probability of 25%. for the question we remove the heads and tail probability and we have 2 outcomes with heads and one without. so 2 to 1 chance or 33.3333 recuring chance.

Difference between distance and Euclidean distance?

There are many ways to measure distance in math. Euclidean distance is one of them.

Given two points P1 and P2 the Euclidean distance ( in two dimensions, although the formula very easily generalizes to any number of dimensions) is as follows:

Let P1 have the coordiantes (x1, y1) and P2 be (x2, y2)

Then the Euclidean distance between them is the square root of

(x2-x1)2+(y2-y1)2 .

To understand some other ways of measuring "distance" I introduce the term

METRIC. A metric is a distance function. You put the points into the function (so they are its domain) and you get the distance as the output (so that is the range).

Another metric is the Taxicab Metric, formally known as the Minkowski distance.

We often use the small letter d to mean the distance between points.

So d(P1, P2) is the distance between points. Using the Taxicab Metric,

d(x, y) = |x1 - x2| + |y2 - y2|

Find the number of distinguishable permutations of the letters in the word manatee?

Take the total number of letters factorial, then divide by the multiple letters factorial (a and e). 7! / (2!*2!) or 1260.

What is the probability of getting a number less than 2 when you roll a dice?

Normal dice have six surfaces, and there is a one in six chance of rolling any specific surface. Only one surface has a number less than 2 (which is the number 1). So it's one chance in six, or approximately 17%.

Find the probability of rolling a sum of 5 with two dice?

The probability of rolling a sum of 5 with two dice is 4 in 36, or 1 in 9, or about 0.1111.

1 and 4

2 and 3

3 and 2

4 and 1

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%

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