From a lot containing 25 items, 5 of which are defective, 4 are, chosen at random. Let `X` be the number of defectives found. Obtain the probability distribution of `X` if the items are chosen without replacement.

In a box there are 5 watches of which 2 are known to be defective two watches are taken out at random let x denote the number of defective watches selected obtain the probability distribution of x also calcuated mean of x

Two items are chosen a lot containing 10 items of which 3 are defective,then the probability that at least one of them is defective:

From a log of 6 items containing 2 defective items, a sample of 4 items are drawn at random. Let the random variable X denote the number of defective items in the sample. If the sample is drawn without replacement, find : (a) The probability distribution of X. (b) Mean of X. (c ) Variance of X.

A lot contains 15 items of which 5 are defective. If three items are drawn at random, find the probability that (i) all three are defective

A lot contains 15 items of which 5 are defective. If three items are drawn at random, find the probability that none of the three is defective. Do this problem directly.

From a lot of 15 bulbs which include 5 defectives, a sample of 2 bulbs is drawn at random (without replacement). Find the probability distribution of the number of defective bulbs.

From a lot of 15 bulbs which include 5 defectives, a sample of 2 bulbs is drawn at random (without replacement). Find the probability distribution of the number of defective bulbs.