Chapter 5 Quiz Solutions 1. The random variable x is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. It is known that the mean number of occurrences in ten minutes is 5.3. The expected value of the random variable x is a. 2.30. b. 5.3. c. 2. d. 10. Correct Response :b 2. The use of the relative frequency method to develop discrete probability distributions leads to what is called a a. empirical discrete distribution. b. non-uniform discrete distribution. c. uniform discrete distribution. d. binomial discrete distribution. Correct Response: a 3. The binomial probability distribution is used with a. a uniform random variable. b. a discrete random variable. c. a continuous random variable. d. an intermittent random variable. Correct Response:b 4. In a binomial experiment consisting of five trials, the number of d