SOLUTION: Find the standard deviation of the random variable. The probabilities that a batch of 4 computers will contain 0, 1, 2, 3, and 4 defective computers are 0.6274, 0.3102, 0.0575,

Question 868154: Find the standard deviation of the random variable.
The probabilities that a batch of 4 computers will contain 0, 1, 2, 3, and 4 defective computers are
0.6274, 0.3102, 0.0575, 0.0047, and 0.0001, respectively.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Note : Your probabilities do not sum to 1 but rather 0.9999.
Find the expected value

Now find the variance,

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