Q. 123.5( 4 Votes )

An urn contains 5 red and 2 black balls. Two balls are randomly drawn. Let X represent the number of black balls. What are the possible values of X? Is X a random variable?

Answer :

Given: An urn containing 5 red and 2 black balls.

Let R represent red ball and B represent black ball.


Two balls are drawn randomly. Hence, the sample space of the experiment is S = {BB, BR, RB, RR}


X represents the number of black balls.


X(BB) = 2


X(BR) = 1


X(RB) = 1


X(RR) = 0


Therefore, X is a function on sample space whose range is {0, 1, 2}.


Thus, X is a random variable which can take the values 0, 1 or 2.

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