A portfolio has an annual return of $13\mathrm{.}50\%$ and an annual return standard deviation of $26\mathrm{.}60\%$

a$.$ Caclulate the expected return over $4$ years.

b$.$ calculate the $4-$year return standard deviation

c$.$ Calculate the loss level that can be expected over a $4-$year investment horizon with a probability of $10\%.$

d$.$ Calculate the loss level that can be expected over a $4-$year investment horizon with a probability of $2\%$

e$.$ Calculate the probability of a loss level of $20\%$ over $4$ years.