Average return on a portfolio is $12\mathrm{.}2$ percent

with a standard deviation of $19\mathrm{.}7$ percent.

Assuming that the frequency distribution is at

least approximately normal, the probability that

the return in a given year is in the range of $\_\_\_\_\_\_\_\_\_$

is about $5$ perce$-37\mathrm{.}05$ percent to $61\mathrm{.}45$ percentnt. $($OPTIONS$)$ a$.-17\mathrm{.}35$ percent to $41\mathrm{.}75$ percent.

b$.-37\mathrm{.}05$ percent to $61\mathrm{.}45$ percent. c$.-27\mathrm{.}2$ percent to $51\mathrm{.}6$ percent. d$.-7\mathrm{.}5$ percent to $31\mathrm{.}9$ percent