The historical returns on a portfolio had an average return of $15$ percent and a

standard deviation of $18$ percent. Assume that returns on this portfolio follow a

bell$-$shaped distribution.

a$.$ Approximately what percentage of returns were greater than $33$ percent?

Note: Round your answer to the nearest whole percent.

Percentage of returns

b$.$ Approximately what percentage of returns were below $-21$ percent?

Note: Round your answer to $1$ decimal place.

Percentage of returns