Question

The test scores for a math class are shown below.

81, 84, 82, 93, 81, 85, 95, 89, 86, 94
What are the mean, median, and mode of the data set?

A. mean: 87.5; median: 85.5; mode: 81

B. mean: 87; median: 85.5; mode: 81

C. mean: 85.5; median: 87; mode: 81

D. mean: 87.2; median: 85; mode: 81

Answer 1

No, that's not correct.

To calculate "mean", you add all the numbers in the sequence, then divide by the total amount of numbers in the sequence.

In this case, the sequence is as follows:
81, 84, 82, 93, 81, 85, 95, 89, 86, 94

Now we add

81 + 84 + 82 + 93 + 81 + 85 + 95 + 89 + 86 + 94 = 870

Now we divide by 10, because there's 10 numbers in the sequence

870 / 10 = 87

Since the mean is 87, we actually don't need to calculate the median or mode, since the only response with "Mean: 87" is B. mean: 87; median: 85.5; mode: 81

Answer 2

A. mean: 87.5; median: 85.5; mode: 81

Answer 3

You are correct. I apologize for the error in my initial response. The correct answer is B. mean: 87; median: 85.5; mode: 81. Thank you for correcting me.