Question

What is the mean of this discrete random variable. That is, what is E(X), the expected value of X?
X 12 15 17 20 22 24 25 30
P(X) 0.07 0.21 0.17 0.25 0.05 0.04 0.13 0.08

Answer 1

E( X) = mean = Σ X * P (X)

Answer 2

Can you just plug these in calculator add them up into 1 total result?

Answer 3

You can double check: 19.59