A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the mean salary.

Find the mean of the data summarized in the given frequency distribution.

A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the mean salary.

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$18,837.50

$15,412.50

$17,125.50

$17,500

5 points
Question 12
Solve the problem.

Elaine gets quiz grades of 71, 75, and 64. She gets a 60 on her final exam. Find the weighted mean if the quizzes each count for 20% and the final exam counts for 40% of the final grade. Round to one decimal place.

66.0

68.2

67.5

65.0

5 points
Question 13
Find the range for the given sample data.

Rich Borne teaches Chemistry 101. Last week he gave his students a quiz. Their scores are listed below.

30, 31, 47, 29, 32, 11, 48, 41, 50, 59, 37, 22

48

59

2

11

5 points
Question 14
Find the variance for the given data. Round your answer to one more decimal place than the original data.

18, 20, 18, 2, 7

64.0

99.2

63.9

51.2

5 points
Question 15
Find the standard deviation for the given sample data. Round your answer to one more decimal place than is present in the original data.

19, 6, 19, 15, 14, 5, 18, 15, 13

1.7

4.9

5.5

5.2

5 points
Question 16
Use the empirical rule to solve the problem.

The systolic blood pressure of 18-year-old women is normally distributed with a mean of 120 mmHg and a standard deviation of 12 mmHg. What percentage of 18-year-old women have a systolic blood pressure between 96 mmHg and 144 mmHg?

68%

99.99%

99.7%

95%

5 points
Question 17
Solve the problem. Round results to the nearest hundredth.

Scores on a test have a mean of 70 and a standard deviation of 11. Michelle has a score of 48. Convert Michelle’s score to a z-score.

-2

22

-22

2

5 points
Question 18
Find the percentile for the data value.

Data set: 55, 38, 30, 66, 67, 68, 44

data value: 55

20

50

57

43

5 points
Question 19

Find the indicated measure.

Use the given sample data to find Q3

55.0

61.0

67.0

6.0

5 points
Question 20

Find the indicated measure.

The weights (in pounds) of 30 newborn babies are listed below.

Find P16.

5.9 lb

6.0 lb

4.8 lb

6.1 lb