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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
What is the probability of tossing 4 pennies and landing on heads twice and tails twice?
4C2(1/2)4 = 6/16 = 3/8
If a coin is tossed 8 times what is the probability that it will land on heads exactly four times?
You can use a tree diagram or a binomial:
I choose a binomial:
8!/(4! * 4!) * .5^4 * .5 ^ 4
70 ways 8 flips can end in 4 v 4, * chance of 4 heads, * chance of 4 tails = .2734375 ~ 27.34 percent.
What are the possible outcomes for the number of tulips that could grow?
If we plant 5 tulip it could grow 3 only
What is probability you will pull a spade if you've already pulled a jack?
Since you didn't specify the suit of the jack, there are two possible answers. If the jack was a spade, the probability of drawing another spade is 12/51 or 23.5%. If the jack was NOT a spade, the probability of drawing a spade is 13/52 or 25%.
It is a probability from 1 that it will happen to 0 that it will not happen
What is the probability of rolling a seven in any combination on a pair of dice?
6/36 which is equal to 1/6
What are the odds of rolling less that a 4 when rolling a die once?
if you rollid a die once the odds of getting less than four would be 3/6 or 50%.
When finding the outcome on a dice do you times the probability together?
yes you times it then simplify
What is the formula for finding numbers within two standard deviations of a mean?
The numbers must be greater than (mean - 2*sd) and laess than (mean + 2*sd).
What is the probability of rolling a 1 with six dice?
The probability of rolling at least one '1' with six dice is 66.5% [1-(5/6)^6]*100%
What is the probability you will roll two prime numbers on a dice?
It is a certainty - if you roll the die often enough. And on one roll it is impossible. Unfortunately you have chosen not to specify how many times the die is rolled, and without that crucial bit of information, it is not possible to give a more helpful answer.
How many arrangements can be madefrom the letter art?
The letters of the word "art" can be ordered in 6 ways.
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.
1/12
What measurements fall beyond three standard deviations from the mean?
Usually they would be observations with very low probabilities of occurrence.
What is the probability of rolling 2 ones followed by 2 ones?
( 2 / 36 ) x ( 2 / 36 ) = 0.003086 (rounded)
How many possible outcomes sum of dots are there if you throw the two dice on the board?
The sum can be any number from 2 to 12.
That's 11 possible outcomes.
If the cards are numbered from 1 to 8 what is the chance of picking a 6 from the box?
The answer depends on how many sets of 1-8 numbered cards are in the box, how many are drawn and whether or not they are replaced after drawing.
