Question

Mary's Time Spent Exercising

Week 1
Sun
Week 2
0 min
Mon
0 min
45 min
Tue
45 min
45 min
Wed
40 min
Thu
45 min
50 min
50 min
Which of the following best explains why the mean is NOT an appropriate indicator of how much time Mary spends exercising on a typical day?
Fri
40 min
35 min
Sat
50 min
0 min
35 min

Answer 1

C. The mean is skewed by the days Mary did not exercise.

Explanation:

You want to know why the mean is not an appropriate indicator fo Mary's exercise time on a typical day.

Mean

The mean of the given times is about 34 minutes. When the zero days are removed, the mean is about 44 minutes. On Mary's exercise days, her times range from 35 to 50 minutes, with the median and mode being 45 minutes.

Apparently, the days with 0 minutes skew the mean, choice C.

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