An Urn Contains 50 Black Balls and 20 Blue Balls

question 85

Multiple Choice

An urn contains 50 black balls and 20 blue balls.If you select 30 balls at random,what is the standard deviation of the number of black balls?

• A)3.55
• B)1.88
• C)4.24
• D)2.85
• E)4.62

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