Scores on a Test Are Normally Distributed with a Mean $63.2$

Multiple Choice

Scores on a test are normally distributed with a mean of $63.2$ and a standard deviation of $11.7$ . Find $P _ { 81 }$ , which separates the bottom $81 \%$ from the top $19 \%$ .

A) $0.291$
B) $73.5$
C) $0.88$
D) $66.6$