Chapter 17, Problem 3E

Consider the normal distribution represented by the normal curve in Fig. 17-14. Assume that P and $P{\displaystyle \oint }$ are the two points of inflection of the curve.

Figure 17-14

a. Find the median M of the distribution.

b. Find the standard deviation $\sigma$ of the distribution.

c. Find the third quartile ${\text{Q}}_3$ of the distribution.

d. Find the first quartile ${\text{Q}}_1$ of the distribution.