QUIZ 13
Name
Prob. 1 A marksman's chance of hitting a target with each of his shots is 60%. If he fires 30 shots, what is the probability of his hitting the target
a. at least 20 times?
b. between 15 and 20 times, inclusive?
Prob. 2 The general manager of the Service Department of the MCA Television Company has estimated that the time that elapses between the dates o purchase and the dates on which the 19-inch sets manufactured by the company first require service is normally distributed with a mean of 22 months and a standard deviation of 4 months. If the company gives a 1-year warranty on parts and labor for these sets, determine the percentage of sets manufactured and sold by the company that may require service before the warranty period runs out.