Assume That $z$ Scores Are Normally Distributed with a Mean of 0 and of 0

Multiple Choice

Assume that $z$ scores are normally distributed with a mean of 0 and a standard deviation of 1 . If $P ( - a < z < a ) = 0.4314$ , find $a$ .

A) $- 0.18$
B) $0.3328$
C) $0.57$
D) $1.49$