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# ented by a histogram approximately symmetric and quot;bell shapedquot;, what percent of observations falls within 3 standard deviations of the mean?...

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%