A lot consists of 12 good pencils, 6 with minor defects and 2 with major defects. A pencil is choosen at random. The probability that this pencil is not defective, is

A lot consists of 12 good pencils , 6 with minor defects and 2 with major defects .A pencil is chosen at random .Find the probability that this pencil is not defective.

Goods with minor defects are sold at:

(i) 4 defective pens are accidentally mixed with 16 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is drawn at random from the lot. What is the probability that the pen is defective ?

A bag has 6 green, 5 red, 7 blue and 3 pink pencils. One pencil is drawn at random. Find the probability that the pencil is neither green nor pink.

In a bundle of 50 shirts, 44 are good, 4 have minor defects, and 2 have major defects. What is the probability that (a) a trader buys only good shirts? (b) a trader rejects only a shirt with major defects?

In a bundle of 50 shirts, 44 are good, 4 have minor defects and 2 have major defects. What is the probability that : (ii) it is acceptable to a trader who rejects only a shirt with major defects ?

A lot of 20 bulbs contain 4 defective ones. One bulb is selected at random from the lot. What is the probability that this bulb is defective? Suppose the bulb selected in previous case is not defective and is not replaced. Now one bulb is selected at random from the rest. What is the probability that this bulb is not defective?

A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb is drawn is previous case is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?