Determine the whole number of standard deviations that includes all data values. The mean price of the nonfiction books on a best-sellers list is $21.58; the standard deviation is
$2.87.
$18.00,
$22.95, $21.95, $22.95, $19.00, $24.00, $28.00, $20.00, $18.95, $19.95
All of the values fall within standard deviation(s) of the mean.