TS EAMCET · Maths · Probability
Two balls are drawn at random from a bag containing black balls and white balls. If the random variable denotes the number of white balls drawn, then the mean of is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
Number of white balls can be 0, 1 or 2. PX=0=C25C28=1028 PX=1=C15×C13C28=1528 PX=2=C23C28=328 Required mean =0×PX=0+1×PX=1+2×PX=2 =0+1528+628 =2128=34
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