In a Box of 8 Batteries,5 Are Dead

question 104

Multiple Choice

In a box of 8 batteries,5 are dead.You choose two batteries at random from the box.Let the random variable X be the number of good batteries you get.Find the standard deviation of of X.

• A)σ = 0.78
• B)σ = 0.40
• C)σ = 0.47
• D)σ = 0.59
• E)σ = 0.63

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