A sample of 2,500 people was asked how many cups of coee they drink in the morning. You are given the following sample information.

For the expected value, it is the sum of x(P)x. And E(X)=mean. So you have to figure out the probabilities for each category first. 0 cups=.28, 1 cup=.36,2 cups=.24,3 cups=.12.

But from here I’m stumped. Do I use Sum(X-Mu)^2*P(X)

More interested in the process to calculate than the answer as we can practice our quizzes endlessly to practice for test, values change every time.