Here are 10 test scores: 73, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these scores is 78.3.
Does this set have an outlier and, if so, how does removing it affect the mean?
A.
The set has 73 as an outlier and removing it increases the mean by about 0.5.
B.
This data set has no outliers.
C.
The set has 73 as an outlier and removing it decreases the mean by about 10.
D.
The set has 73 as an outlier and removing it decreases the mean by about 0.5.

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so B

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