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PROBABILITY : PROBABILITY CHAPTER - 15 EXERCISE - 15.1

QUESTION 16:-12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is good one. : QUESTION 16:- 12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is good one.

QUESTION 17:-(i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn from the lot. What is the probability that this bulb is defective?(ii) Suppose the bulb drawn in (i) is not defective and is not replaced . Now one bulb is drawn at random from the rest. What is the probability that bulb is not defective? : QUESTION 17:- (i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn from the lot. What is the probability that this bulb is defective? (ii) Suppose the bulb drawn in (i) is not defective and is not replaced . Now one bulb is drawn at random from the rest. What is the probability that bulb is not defective?

QUESTION 18:-A box contains 90 discs which are numbered from 1 to 90.If one disc is drawn at random from the box, find the probability that it bears (i) a two digit number (ii) a perfect square number (iii) a number divisible by 5. : QUESTION 18:- A box contains 90 discs which are numbered from 1 to 90.If one disc is drawn at random from the box, find the probability that it bears (i) a two digit number (ii) a perfect square number (iii) a number divisible by 5.

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