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

Question

Quizplus · Accepted Answer

The Answer of 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

An Urn Contains 50 Black Balls and 20 Blue Balls