Calculate the expected return and the standard deviation

Question

Break down, step by step, and solve:

The potential return on the Butterfield Corp. stock has the following distribution:

Prob.                     Return

.05                          -30%

.15                          0%

.45                          5%

.15                          12%

.10                          30%

.05                          100%

Calculate the expected return and the standard deviation for the Butterfield Corp.