Need help solving a problem

Question

Cost of widgets follows a bell curve. The mean cost of a widget is $387, with a standard deviation of $19. Between what two values do about 68% of the widgets cost?

Answer 1

You should have learned that one standard deviation above and below the mean encompasses about 68% of the area under the "bell curve". That means that $387 ± $19 is the range of prices that a widget would cost. I'm sure you can add and subtract $19 from $387 to get the two values.