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From a lot of 15 bulbs which include ...

From a lot of 15 bulbs which include 5 defectives, a sample of 4 bulbs is drawn one by one with replacement. Find the probability distribution of number of defective bulbs. Hence find the mean of the distribution.

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The correct Answer is:
`P(0)=(16)/(81),P(1)=(32)/(81),P(2)=(24)/(81),P(3)=(8)/(81),P(4)=(1)/(81);" Mean"=(4)/(3)`.
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