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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

Importances of probability in real life?

the importance of probability of our life is wait example: A: he is doing a coin toss now...

B:really, ok tell me he is going to get head or tail.

A: the probability is 50/50 i dont no.

seee you stupid,,,,,,idiot......i am telling those words becuz i dont even really know the ans ;P

What does it mean when 9 furry caterpillars crawling head to tail across your way?

I know, their showing you how to "Heel-an-Toe, Ah....no, they heard this is how to get all your DUCKS in a row, er.. I think.

Alternate Wordings for 'In a shop there are 20 customers 18 of whom will make a purchase. If three customers are selected one at a time at random what is the probability that all will make a purchase?

Here is another way to phrase the question: If 18 out of 20 customers make a purchase in a shop, and three customers are selected at random, what is the probablity that all will make a purchase?

Each random customer has a 18/20 chance of being one that purchased, so the probability that all three make a purchase is 18/20*18/20*18/20=.729

How many different outcomes are possible when flipping a coin and rolling a dice?

The coin can result in one of two possibilities. For each of those . . .

The cube has 6 possibilities.

Total possibilities for the coin and the cube = 2 x 6 = 12 .

What is a penny with a tails side and the other side is smooth with a circular bump in the middle worth?

Sounds like a possible capped die error -- worth $50-$100. Check out Mike Byers' Error Coin Website -- http://mikebyers.com -- and perhaps you can send pictures to him for an exact appraisal.

What is probability 2 girls are chosen if 10 students are girls and 15 are boys?

The probability of choosing 2 girls at random from group of 25 students of which

10 are girls and 15 are boys is:

P( 2 girls) = (10/25)∙(9/24) = 3/20 = 0.15 = 15%

What is the probability of rolling an even number on a standard 6 sided die if an even number is rolled 7 times out of 12?

A standard die has no memory and so the probability of rolling an even number is always a half.

If you did not know that the die was standard and were using the fact that 7 out of 12 rolls were even as an empirical estimate for a loaded die then the answer is 7/12.