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Using the Empirical Rule, about 95 percent of the monthly food expenditures are between what two amounts? A. $100 and $200 B. $85 and $105 C. $205 and $220 D. $110 and $190 9. The ages of all patients in the isolation ward of a hospital are 38, 26, 13, 41 and 22. What is the population variance? A. 106. 8 B. 91. 4 C. 240. 3 D. 42. 4 10. The weights (in grams) of the contents of several small bottles are 4, 2, 5, 4, 5, 2 and 6. What is the sample variance? A. 6.9 2 B. 4.8 0 C. 1.9 6 D. 2.3 3 11. The distribution of a sample of the outside diameters of PVC gas pipes approximates a symmetrical, bellshaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. About 68 percent of the outside diameters lie between what two amounts? A. 13.5 and 14.5 inches B. 13.0 and 15.0 inches C. 13.9 and 14.1 inches D. 13.8 and 14.2 inches 12. If the sample variance for a frequency distribution consisting of hourly wages was computed to be 10, what is the sample
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