On a multiple choice test of 13 questions, each question has four (4) possible answers, one of which is correct. For students who guess at all answers, find the following, if X is the number of correct guesses. (i). The mean of the random variable X. (ii). The standard deviation of the random variable X. (b).In a city the probability that a person will pass his or her driving test the first attempt is 0.66.Four people are selected at random from among those taking their driving test for the first time. Determine the following. (i). The probability that exactly one person passed the test. (ii). The probability that exactly two persons passed the test. (iii) The probability that at least two persons passed the test. (iv).The probability that at least three persons passed the test.