1. The age distribution for a sample of employees in SP Company is shown in table below: Age Number of workers 21-25 10 26-30 35 31-35 16 36-40 14 41-45 13 46-50 10 51-55 3 Calculate variance and standard deviation. (10 M) 2. A random variable X has a probability distribution defined as shown . X -2 -1 0 2 P(x) 0.3 0.1 0.15 0.4 0.05 a. Find E(X) (4M) b. Calculate VAR(X) (6M)