In a factory that manufactures light bulbs, 0.04% of all light bulbs manufactured are defective. On the average, there will be three defectve light bulbs out of how many manufactured?

Name the gas used in : light bulbs

If 3% of electric bulbs manufactured by a company are defective , then the probability that a sample of 100 bulbs has no defective is

If 3% of electric bulbs manufactured by a company are defective , then the probability that a sample of 100 bulbs has no defective is

In a factory which manufacture bulbs,machine X, Y and Z manufactures respectively 25%, 35% and 40% of the bulbs. Of the output 1%, 2% and 3% are respectively defective bulbs. A bulb is drawn at random and found to be defective. What is the probability that it is manufactured by machine Y ?

In a factory which manufactures bulbs, machines X, Y and Z manufactures respectively 25%, 35% and 40% of the bulbs. Of their outputs 1, 2 and 3 percent re respectively defective bulbs. A bulb is drawn at random and is found to be defective. What is the probability that it is manufactured by the machine Y?

If 3% of the electric bulbs manufactured by a company are defective , then the probability that in a sample of 100 bulbs, exactly 5 bulbs are defective is

A factory produces electric bulbs. If 1 out of every 10 bulbs is defective and the factory produces 630 bulbs per day, find the number of defective bulbs produced each day.

In the two circuits shown, all the light bulbs and batteries are identical. If A,B and C repectively denotes the brightness of light bulbs A,B & C then

A box contains 16 bulbs, out of which 4 bulbs are defective. Three bulbs are drawn at random from the box. Let X be the number of defective bulbs drawn. Find the mean and variance of X.