Chapter 3 -
80. Creek Ratz is a very popular restaurant located along the coast of northern Florida. They serve a variety of steak and seafood dinners. During the summer beach season, they do not take reservations or accept “call ahead” seating. Management of the restaurant is concerned with the time a patron must wait before being seated for dinner. Listed below is the wait time, in minutes, for the 25 tables seated last Saturday night.
28 39 23 67 37 28 56 40 28 50
51 45 44 65 61 27 24 61 34 44
64 25 24 27 29
a. Explain why the times are a population.
The times are considered a population, because they encompass all of the seating times from that Saturday night; anything less than all would be a sampling.
b. Find…show more content… The quality control engineer has been checking the output by almost continuous sampling since the abnormal condition began. What is the probability that in a sample of 10 pieces:
a. Exactly 5 will be defective?
0.00149
b. 5 or more will be defective?
0.00163
62. Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
a. None of the antennas is defective.
0.0487
b. Three or more of the antennas are defective.
0.5785
Chapter 7 –
42. The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model. Assume the assembly times follow the normal distribution.
a. Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? z value for 29 hours = (29-32)/2 = -1.5 z value for 34 hours = (34-32)/2 = 1
34.13%
b. What percent of the garages take between 29 hours and 34 hours to erect?
77.45%
c. What percent of the garages take 28.7 hours or less to erect?
4.95%
d. Of the garages, 5 percent take how many hours or more to erect?
35.2898 hours
45. Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal