Here are 10 test scores: 30, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these numbers are 74.
Does this set have an outlier and, if so, how does removing it affect the mean?
A. The set has 30 as an out outlier, and removing it increases by about 5.
B. The data has no outliers.
C. The set has 30 as an outlier and removing it decreases the mean by about 5.
D. The set has 30 as an outlier and removing it decreases the mean by about 10.

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I'm not sure :/

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