An investment strategy has an expected return of $13$ percent and a standard deviation of $7$ percent. Assume investment returns are bell shaped.

a$.$ How likely is it to earn a return between $6$ percent and $20$ percent? $($Enter your response as decimal values $($not percentages$)$ rounded to $2$ decimal places.$)$

b$.$ How likely is it to earn a return greater than $20$ percent? $($Enter your response as decimal values $($not percentages$)$ rounded to $2$ decimal places.$)$

c$.$ How likely is it to earn a return below $1$ percent? $($Enter your response as decimal values $($not percentages$)$ rounded to $3$ decimal places.$)$