21
QuizMultiple Choice

Unit Test — Unit test

Question 21 • EAP-Algebra Functions and Data Analysis B

Hank surveyed twenty-five locally owned small businesses in his town to determine the number of employees they have. The results are shown in the first table. He then took a random sample of five responses, and wrote them in the second table. Compare the mean of the population with the mean of a sample. Population Data0331322254333212423313524Sample Data02334What is the difference between the mean of the population and the mean of the sample?

Answer
A
0.24
B
0.36
C
2.40
D
2.64

Explanation

The 25 population values add to 66, so the population mean is 66 ÷ 25 = 2.64. The five sample values, 0, 2, 3, 3, and 4, add to 12, so their mean is 12 ÷ 5 = 2.40. The difference is 2.64 − 2.40 = 0.24, which is choice A.

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