What is the mean of the test scores listed below? 100, 78, 47, 84, 93, 78

Rationale

The mean of the test scores listed is 80.

The mean, or average, is calculated by adding up all the values in a set and then dividing by the number of values in that set. In this case, the sum of the test scores (100, 78, 47, 84, 93, 78) is 480 and there are 6 scores, so the mean is 480 divided by 6, which equals 80.

A (96) YOUR ANSWER

The mean of the test scores is not 96. This value seems to be closer to the highest score (100) rather than the mean. The mean is calculated by adding all scores and dividing by the number of scores. The calculation does not result in 96.

B (78) YOUR ANSWER

The mean of the test scores is not 78. Although 78 is a score that appears twice in the set, the mean is calculated by adding all scores and dividing by the number of scores. The calculation does not result in 78.

C (80) CORRECT

The mean of the test scores is indeed 80. This is found by adding all the test scores (100, 78, 47, 84, 93, 78) to get a sum of 480, and then dividing by the number of scores (6). The result is 80.

D (82) YOUR ANSWER

The mean of the test scores is not 82. Although 82 is close to the actual mean (80), the calculation of the mean by adding all scores and dividing by the number of scores does not result in 82.

Conclusion

The mean, or average, of a set of numbers is calculated by adding all the numbers and then dividing by the count of numbers. For the test scores provided, the sum is 480 and the count is 6, resulting in a mean of 80. Other choices represent either actual scores from the set or numbers close to the actual mean, but do not correctly represent the calculated average.

What is the mean of the test scores listed below? 100, 78, 47, 84, 93, 78

The mean of the test scores listed is 80.

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