Two investments generated the following annual returns:

a$.$ What is the average annual return on each investment? Round your answers to one decimal place.

The average annual rate of return on $x$ :

The average annual rate of return on Y:

$\%$

b$.$ What is the standard deviation of the return on investments $x$ and $Y?$ Round your answers to two decimal places.

Standard deviation of $x$ :

Standard deviation of Y:

c$.$ Based on the standard deviation, which investment was riskier?

was riskier.