The items produced by a company contain 10% defective items. Show that the probability of getting 2 defective items in a sample of 8 itmes is `frac{28xx9^6}{10^8}`.

10% of tools produced by a certain manufacturing process turn out to be defective. Assuming binomial distribution, the probability of 2 defective in sample of 10 tools chosen at random, is

In a box containing 100 bulbs, 10 are defective. What is the probability that out of a sample of 5 bulbs, exactly 2 are defective?

In a box containing 100 bulbs, 10 are defective. The probability that out of a sample of 5 bulbs none is defective is :

From a lot of 10 items containing 3 defective items a sample of 4 items is 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: the probability distribution of X.

From a lot of 10 items containing 3 defective items a sample of 4 items is 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: mean of X.

From a lot of 10 items containing 3 defective items a sample of 4 items is 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: variance of X.