20. An investment pays $1,200 a quarter of the time; $1,000 half of the time; and $800 a
quarter of the time. Its expected value and variance respectively are:
a. $1,000; 20,000 dollars2
b. $1,050; 20,000 dollars2
c. $1,000; 40,000 dollars2
d. $1,000; 80,000 dollars2
21. An investment pays $1,000 three quarters of the time, and $0 the remaining time.
Its expected value and variance respectively are:
a. $1,000: 62,500 dollars2
b. $750; 46,875 dollars
c. $750; 62,500 dollars
d. $750; 187,500 dollars2
22. The standard deviation is generally more useful than the variance because:
a. it is easier to calculate.
b. variance is a measure of risk, where standard deviation is a measure of return.
c. standard deviation is calculated in the same units as payoffs and variance isn’t.
d. it can measure unquantifiable risk.