14. The heights of fully grown English oak (also known as Brown oak) trees are normally distributed with a mean of 95 feet and a standard deviation of 10 feet. (a) What proportion of fully grown English oak trees are taller than 110 feet? (5pts) (b) What proportion of fully grown English oak trees are shorter than 90 feet? (5pts) 15. The random variable X has binomial distribution Bin (10,0.3), determine the following: (a) Find P(X=5). (2pts) (b) Find E(X). (3pts) (c) Find Var(X). (3pts)