Question

A stock will provide a rate of return of either –20% or +28% .

1. If both possibilities are equally likely, calculate the expected return and standard deviation.

Answer 1

How can you find the expected returns, if you don't know the principal?

Do you want the "standard deviation" or merely the deviation?

Repost with more specific phrasing and data.

Answer 2

By the way, you subject is math.