Two balls are drawn at random from a bag containing 5 black balls and 3 white balls. If the random variable X denotes the number of white balls drawn, then the mean of X is.

Question

Accepted Answer

Correct answer: C. (c) Let random variable X=0 ,1 ,2 Now P (X=0 )= ^5C_28 ^8C_2= 514 P (X=1 )= ^5C_1 ^3C_1 ^8C_2= 1528 ⇒P (X=2 )= ^3C_28= 3C_2 Now mean of X = 0.05emx_iP_i=0 514+1 1528+2 328= 2128= 34

$Two balls are drawn at random from a bag containing 5 black balls and 3 white balls. If the random variable X denotes the number of white balls drawn, then the mean of X is.$

Solution

More Probability PYQs