# a coin is tossed 72 times whats the standard deviation for the number of heads that will be tossed [Solved] n = 72
p = 1/2 = q

mean = np
variance = npq = 18

the expectation of this is np
n = 72, p = 0.5 for a fair coin

Joe is right in his math, but you do not know the actual std dev since you dont have the actual results. You almost never get a perfect distribution, even with a binary choice, so the observed std dev will differ from the predicted.

72*0.5 = 36

the expectation of this is np
n = 72, p = 0.5 for a fair coin

and thats all I got lol. wiki wont tell me st. dev. or the formula to get it, and I cant recall for a discrete distribution how to do it. its some sort of sum, if you have formulas in your book you can get it

and thats all I got lol. wiki wont tell me st. dev. or the formula to get it, and I cant recall for a discrete distribution how to do it. its some sort of sum, if you have formulas in your book you can get it

72*0.5 = 36

This post is last updated on hrtanswers.com at Date : 1st of September – 2022

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