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The possible returns for 2 stocks can be found in the following table: Probability Stock X Stock Y .25 6 7 .25 8 8 .40

The possible returns for 2 stocks can be found in the following table:

Probability

Stock X

Stock Y

.25

6

7

.25

8

8

.40

10

9

.10

13

11

Average

8.80

8.45

Variance

4.46

1.3475

Calculate the standard deviation of X - Y.

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