Name________________________________________ Date ________________ Period ______ Discrete Math Chapter 9 Final Exam Review Use the data to make a histogram. 1) Alice asked 20 people how many magazines they purchased in the last year. Use four intervals starting with 0-9.
Find the mode or modes. 5) 89, 25, 89, 13, 25, 29, 56, 89 A) 51.9 B) 42.5 C) 89 D) 25
6 15 3 36 25 18 12 18 5 30
Solve the problem. Round to the nearest hundredth, if necessary. 6) The following data gives the number of applicants that applied for a job at a given company each month of 1999: 64, 67, 94, 77, 78, 85, 87, 89, 91, 94, 74, 64. What is the mode of the data? A) There is no mode. B) 94 C) 64 D) 94 and 64
24 7 0 22 33 24 19 4 12 9
Find the standard deviation. 7) 4, 3, 19, 13, 14, 13, 19, 6, 10 A) 6.4 C) 1.4
Find the mean. Round to the nearest tenth. 2) Value Frequency 162 3 178 4 224 2 290 3 348 1 390 2 A) 224.3 B) 106.1 C) 242.9 D) 280.3
Find the percent of the total area under a normal curve that is contained within the specified interval. 8) Between z = -1.68 and z = 1.68. A) 90.8% B) 95.3% C) 90.4% D) .93% Find a z-score satisfying the given condition. 9) 33% of the total area is to the right of z. A) .45 B) .74 C) -.44 D) .44
Solve the problem. 3) Using the employment information in the table on Alpha Corporation, find the mean for the grouped data. Years of Service 1-5 6 - 10 11 - 15 16 - 20 21 - 25 26 - 30 A) 10.83 C) 15.50
Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of the indicated results. 10) Less than 259 heads A) .773 B) .224 C) .776 D) .788
Frequency 5 20 25 10 5 3 B) 13.57 D) 12.93
Find the median. 4) 5, 1, 23, 18, 22, 50, 38, 34 A) 22 C) 23
B) 6.0 D) 5.6
Assume the distribution is normal. Use the area of the normal curve to answer the question. Round to the nearest whole percent. 11) The average size of the fish in a lake is 11.4 inches, with a standard deviation of 3.2 inches. Find the probability of catching a fish longer than 17 inches. A) 8% B) 96% C) 5% D) 4%
B) 22.5 D) 23.5
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