4. Use R to solve the following. Report your code, as well as your final answer. (a) Suppose X ~ N(u = 95, o2 = 36). Find the normal curve area to the left of x = 82. (b) Suppose X ~ N(u = 91, o2 = 25). Find the value of a that has 94% of the normal curve area to the right. (c) Suppose X ~ Exp(3 = 1/3). Find P(X > 2)