QUESTION 4 of 10: Stock returns vary from year to year. The more variance a stock displays the greater the potential risk. These are the
rates of return for a stock over the last five years. Calculate the variance of these investment returns: 10, 30, 15, 5, 20. Hint: The
variance
of
a series of numbers is the sum of the squares of their differences from the mean (average) of the numbers divided by the number of items
in the series.
O O
a) 21
b) 53
c) 74
d) 95