Exhibit.

The variance of n numerical data x1, x2, x3, , , , , xn with the mean x is equal to were S is the sum of the equal differences for

For the shares of stock purchased and then sold by the investors shown, the mean of the 5 numbers for Stock Y is 50 and the corresponding mean for Stock X is 70. The variance of the 5 numbers for Stock }' is what fraction of the corresponding variance for Stock X ?

A)

B)

C)

D)

E)