please help

not on excel please i dont get how to do it

1. An investor is considering two investments, an office building and bonds. The possible returns from each investment and their probabilities are as follows: Bonds: Office Building Return Probability $50,000 30 Return Probability $30,000 .60 40,000 40 60,000 .20 80,000 .10 10,000 .30 1.00 0 .10 1.00 X Using expected value and standard deviation as a basis for comparison, discuss which of the two investments should be selected