The Independent Random Variables X And Y Are Defined By The Following Probabilit

The independent random variables X and Y are defined by the following probability distribution tables.

X

1

3

6

Y

2

3

5

7

P(X)

.6

.3

.1

P(Y)

.1

.2

.3

.4

Determine the standard deviation of 4X – 5Y.

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