From a lot of 30 bulbs, which includes 6 defectives, 3 bulbs are drawn one by one at random, with replacement. Find the probability distribution of number of defective bulbs. Hence find the mean and variance of the distribution.
From a lot of 30 bulbs, which includes 6 defectives, 3 bulbs are drawn one by one at random, with replacement. Find the probability distribution of number of defective bulbs. Hence find the mean and variance of the distribution.