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Find the standard deviation of the gambling machine with the following distribution. Profit X -1 4 Probability P(X) 0.9 0.1 Hint: the distribution has mean

Find the standard deviation of the gambling machine with the following distribution.

Profit X	-1	4
Probability P(X)	0.9	0.1

Hint: the distribution has mean = -0.5

-2
0
1.5
none of the above

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