Answer to Question #302594 in Statistics and Probability for Lyn

Question

Two balls are drawn in succession without replacement from an urn containing 4 red balls and 5 blue balls. Let R be the random variable representing the number of red balls. Find the values of the random variable R.

Answer 1

Let B be the random variable representing the number of blue balls

R=0, when no red ball occurs; {BB}

R=1 , when 1 red and 1 blue balls occur; {RB,BR} 

R=2, when 2 red balls occur; {RR}

Therefore,

The values of the random variable R are 0, 1, 2.