27. Suppose the respective probabilities are 0.7, 0.2, and 0.1 that a person applying for a driver's licence in Saskatchewan will require 1, 2, or 3 attempts in order to obtain a licence. Let X be a random variable, the number of attempts in order to obtain a licence. Find the mean (expected value) of X. a) 0.63 b ) 2 c) 1 d) 1.4 e) 1.33 28. If P(-2