Find the expected value, variance, and standard deviation of X in the following probability distributions: a. P

Question:

Find the expected value, variance, and standard deviation of X in the following probability distributions:
a. P (X = 1) = 0.05, P (X = 2) = 0.45, P (X = 3) = 0.30, P (X = 4) = 0.20
b. P (X = − 20) = 0.13, P (X = 0) = 0.58, P (X = 100) = 0.29
c. P (X = 0) = 0.368, P (X = 1) = 0.632