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 $24.18; the standard deviation is $ 3.98.

$19.95, $24.00, $21.00, $28.95, $19.00, $27.95, $19.00, $25.95, $26.00, $29.95

All of the values fall within __ standard deviation (s) of the mean.