If a data set is represented by a histogram approximately symmetric and “bell shaped”, what percent of observations falls within 3 standard deviations of the mean?
(1) 50%
(2) 68%
(3) 95%
(4) 99.7%
If a data set is represented by a histogram approximately symmetric and “bell shaped”, what percent of observations falls within 3 standard deviations of the mean?
(1) 50%
(2) 68%
(3) 95%
(4) 99.7%
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