When the outliers are removed, how does the mean change?
dot plot with 1 on 50, 1 on 76, 1 on 78, 2 on 79, 1 on 80, 1 on 81, 2 on 82, 1 on 83
a: the mean decreases by 3.
b: the mean increases by 2.
c: the mean increases by 3.
d: there are no outliers.
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