Question 23

The mean of the test scores is 80.

To find the mean of the test scores 100, 78, 47, 84, 93, and 78, you add all the scores together to get 480 and then divide by the number of scores, which is 6. This calculation yields a mean of 80.

A) 96

Option A is incorrect because the mean of the given scores does not reach this value. The total sum of the scores is 480, and dividing by 6 does not produce 96.

B) 78

Option B is also incorrect. While 78 is one of the test scores, it does not represent the mean. The mean is calculated from all scores, and the average is higher than 78.

C) 80

Option C is correct as it accurately represents the mean of the test scores. By calculating the total of the scores (480) and dividing by the number of scores (6), we arrive at 80.

D) 82

Option D is incorrect since the mean does not equal 82. The calculation shows that the average is lower than this value, disproving this option.

Conclusion

The mean of the test scores is definitively 80, as derived from the proper calculation of the total sum divided by the number of scores. All other options fail to represent the average accurately, either being higher or lower than the calculated mean. Therefore, Option C is the only correct answer.