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Unformatted text preview: An office manager took a sample of the number of cups of coffee that employees in the office drank at work in one month. The results of the sample are as follows: 30 , 12 , 0 , 15 , 26 , 40 , 10 , 12 5. Using the correct symbol, calculate the variance. a. 12.05 b. 12.88 c. 145.11 d. 158 e. 165.84 * 6. What is the interquartile range? a. 4.5 b. 18 c. 20 * d. 35.5 e. 40 7. Calculate the coefficient of variation. a. .6 b. .7 c. 66.46% 2 d. 71.05% * e. 95% 8. What is the range? a. 3.5 b. 18 c. 19 d. 40 * e. 52 9. What is the median? a. .25 b. 13.5 * c. 20.5 d. 26 e. 30 10. A manufacturer claims that the lightbulbs he produces have a mean lifetime of 1,400 hours and that the standard deviation of lifetimes is 150 hours. Find a range in which it can be guaranteed that at least 8/9ths (or about 88.9%) of the lifetimes of these bulbs lie. (950 , 1,850) 3...
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 Spring '08
 HUDGINS
 Standard Deviation, a. b. c., D. E.

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