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0 Question 8 v The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days and a standard deviation of 12 days. In what range would we expect to find the middle 68% of most lengths of pregnancies? Round the answer to one decimal place. Between and days 0 Question 2 v In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 38 and a standard deviation of 8. Using the empirical rule (as presented in the book), what is the approximate percentage of daily phone calls numbering between 22 and 54? ans = % Do not enter HE Bergenitsymbol. 0 Question 7 v The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 48 ounces and a standard deviation of 9 ounces. Using the Empirical Rule, answer the following questions. Suggestion: Sketch the distribution. a) 68% of the widget weights lie between ' and i b) What percentage of the widget weights lie between 21 and 57 ounces? l i% c) What percentage of the widget weights lie below 66? ' % 0 Question 10 v On a nationwide math test, the mean was 60 and the standard deviation was 10. If Roberto scored 80, what was his z-score? Question Help: 8 Message instructor Submit Question 0 Question 6 v The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 65 ounces and a standard deviation of 3 ounces. Using the Empirical Rule, answer the following questions. Suggestion: Sketch the distribution. a) 99.7% of the widget weights lie between b) What percentage of the widget weights lie between 62 and 74 ounces? ' c) What percentage of the widget weights lie below 71? i 0 Question 5 v The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 57 and a standard deviation of 6. Using the 68-95-99] (Empirical) Rule, what is the approximate percentage of lightbulb replacement requests numbering between 51 and 57.7 Theiapprogingepercentage of lightbulb replacement requests numbering between 51 and 57 is l %. (Do not enter the percent symbol.) Question Help: > Video F3 Message instructor Question 4 A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 55 months and a standard deviation of 10 months. Using the 68-95- 99.7 (Empirical) Rule, what is the approximate percentage of cars that remain in service between 35 and 45 months? The approximate percentage of cars that remain in service between 35 and 45 months is %%. Do not enter the percent symbol.)0 Question 9 v Adult men have an average height of 69.0 inches with a standard deviation of 2.8 inches. Find the height of a man with a zscore of 1.93, Round your answer to one decimal place. Question Help: E Message instructor Question 1 In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 57 and a standard deviation of 7. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 50 and 64? Do not enter the percent symbol. ans = % Question Help: Message instructor SubnQuestion 3 The graph illustrates a normal distribution for the prices paid for a particular model of HD television. The mean price paid is $1600 and the standard deviation is $130. 1210 1340 1470 1600 1730 1860 1990 Distribution of Prices Q What is the approximate percentage of buyers who paid between $1470 and $1730? What is the approximate percentage of buyers who paid more than $1860? % What is the approximate percentage of buyers who paid less than $1210? What is the approximate percentage of buyers who paid between $1340 and $1600? % What is the approximate percentage of buyers who paid between $1600 and $1730? %