Suppose the probability of someone wearing a pair of glasses among 5th graders is 39.3%. If there are 52 kids in a class, what will be the standard deviation of this distribution?
Not sure how to get the standard deviation, but I think the variance should be:
Sum of (x-mean)^2/n
But I'm not sure where where the probability should go. X?
Or should I use more of an expected value equation like:
Sum(x-mean)^2*Probability(X)
Please help me understand the process on how to calculate these.