Please help!

An investment has probabilities 0.3, 0.4, and 0.3 of giving returns equal to 40%,15%, and 5%. What are the expected returns and the standard deviations of returns? NOTE: Please show the process of how you get to the final answers. Answers only showing numbers without the process will not receive any credit. You may use /, *, ^(0.5) as divide, multiplication, and square root respectively. For example, square root of 4 can be illustrated as 4^(0.5).