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.

To calculate the mean (also known as average) of a set of numbers, you add up all the numbers and then divide by the count of numbers. In this case, adding 100, 78, 47, 84, 93, and 78 gives a total of 480. Dividing 480 by 6 (the number of test scores) gives a mean of 80.

A (80) CORRECT

This is the correct choice. The sum of all the test scores is 480 and there are 6 test scores. Dividing 480 by 6 gives the mean score of 80.

B (78) YOUR ANSWER

Although 78 is the number that appears twice in the list of scores, it does not represent the mean of the scores. The mean is calculated by adding all values and dividing by the quantity of values, not by identifying the most frequently appearing number.

C (81) YOUR ANSWER

This option is incorrect because when you divide the sum of all scores (480) by the number of scores (6), the result is not 81 but 80.

D (96) YOUR ANSWER

This option is incorrect because it is higher than the mean. The mean of the test scores is 80, not 96.

Conclusion

In conclusion, the mean (or average) of the test scores is obtained by adding all the scores together and then dividing by the number of scores. In this case, the total of the scores is 480 and there are 6 scores, resulting in a mean score of 80. The other options are incorrect as they do not match the actual calculated mean.

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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