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The variance of the 5 numbers for Stock }’ is what fraction of the corresponding variance for Stock X ?

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)

A . Option
B . Option
C . Option
D . Option
E . Option

Answer: E

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