Hi. Would I find the standard deviation first?

Find the expected value of the random variable. The random variable X is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its O A. 3.50 probability distribution is given in the following table. O B. 3.60 x P(X =x) O C. 3.40 0.24 O D. 3.35 1 0.01 2 0.12 3 0.16 4 0.01 5 0.14 0.11 0.21