Chapter 11, Problem 11.46E

(a)

To determine

To place the flags one standard deviation on either side of the mean and find out what is the area between these two values and what does the $68-95-99.7$ rule say this area is and sketch the graph.

(b)

To determine

To repeat part (a) for two and three standard deviations from the mean and again compare the area by the $68-95-99.7$ rule and sketch the graph.