Question

number of reams of paper: 0, 1, 2, 3, 4, 5
probability of using that amount: 0.05, 0.15, 0.40, 0.20, 0.10, 0.10
Find the standard deviation of the number of reams found at the end of the day?

Answer 1

Standard deviation of a probability distribution is given by\[\sigma =\sqrt{\sum_{}^{}(X -\mu)^{2}P(X)}\][xP(x)]\]where x is the number of reams of paper and P(x) is the probability of using that number of reams of paper. Try it now and see if you get it.