Consider an investment for which the expected returns are normally distributed with anexpected return of $11\%$ and an annual standard deviation $($SD$)$ of $12\%.$ What is the probability that during a given year an investor would earn a return that is:

a$.$ greater than $-1\%?$

b$.$ lower than $-1\%$

c$.$ lower than $-13\%$

d$.$ greater than $11\%?$

e$.$ greater than $23\%?$

f$.$ greater than $35\%?$