Dotbombs stock has the following projected rates of return (outcomes): 10%, 15%, and 30%. The probabilities of their outcomes are 15%, 50%, and 35% respectively.

a. What are the expected return and standard deviation of Dotbombs stock?

b. What is the probability that Dotbomb stock will earn a return no more than 15%?

c. What is the probability that Dotbomb stock will earn a return less than 15%?