Question 3 20 pts A random variable X has a valid probability distribution as follows: P() & P(z) 2 P(z) 0 0.1 0 1 0.2 1 2 0.3 4 3 0.2 9 4 0.1 16 5 0.1 25 a. Fill in the above table. b. Find the mean c. Find the variance