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15. Probability
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Q19 of 31 Page 308

A child has a die whose six faces show the letters as given below:


The die is thrown once. What is the probability of getting (i) A? (ii) D?

Total number of possible outcomes on the dice = 6

(i) Total number of faces having A on it = 2


P (getting A) =


=


=


(ii) Total number of faces having D on it = 1


P (getting D) =


=


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17

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 this bulb is not defective?

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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

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Suppose you drop a die at random on the rectangular region shown in Fig. 15.6. What is the probability that it will land inside the circle with diameter 1m?

21

A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that

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(ii) She will not buy it?

Questions · 31
15. Probability
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