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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
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 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%.
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.
The probability is 1. If the maximum number of hairs is 100000 then there can be only 100000 people, each with a different number of hairs: 1, 2, 3, ..., 100000. Then the 100001st person must have the same number as someone in that list. Since the population of NYC is greater than 100001, then the event is a certainty.
What is the probability of tossing 4 pennies and landing on heads twice and tails twice?
4C2(1/2)4 = 6/16 = 3/8
What are the possible outcomes for the number of tulips that could grow?
If we plant 5 tulip it could grow 3 only
Whats is a good black and red deck?
A good red black deck has a lot of creatures that deal lots of damage. The black portion of the deck should have some zombies and other undead stuff. The red portion should be able to boost power and deal a lot of damage
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%.
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%
It is a probability from 1 that it will happen to 0 that it will not happen
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.
How many different combinations of 2 courses can Kevin take out of 6 different classes?
The answer is 15.
(5*6)/2 = 15.
The following are all the possible combinations, where the order is insignificant:
1-2, 1-3, 1-4, 1-5, 1-6, 2-3, 2-4, 2-5, 2-6, 3-4, 3-5, 3-6, 4-5, 4-6, 5-6.
The sum of all those possibilites equals 15.
A third way of finding the answer is to notice that there are 5 ways to combine one class with each of the 5 other classes, 4 ways to combine the second class with the remaining classes, etc. 5 + 4 + 3 + 2 + 1 = 15.
How does pascals triangle connect to combianatorics?
The rth entry in the nth row is the number of combinations of r objects selected from n. In combinatorics, this in denoted by nCr.
