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Probability

Short Answer Type

261. A jar containing 24 marbles. Some are green and other are blue. If a marble is drawn at random from the jar. The probability that it is green is

4 over 7.

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262. 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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263. 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 a good one.

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264.

(i) 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.
(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 this bulb is not defective.

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265.

It is known that in a box of 600 cassettes, 24 cassettes are defective. One cassette is taken out at random from this box. Find the probability that it is a non-defective.

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266. The probability of winning a game is 0.3. What is the probability of loosing it?

Solution not provided.

Ans. 0.7

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267.

The number of matchsticks in each of 30 boxes found to have the following distribution ?

No. of match stikcs

No. of boxes

What is the probability' that a box selected at random will contain
(i) 50 matchsticks
(ii)    less than 48 matchsticks.
(iii)    at least 46 matchsticks.
(iv)    more than 50 matchsticks.

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268. What is the probability that a leap year have 53 Mondays.

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269.

A bag contains lemon flavoured candies only. Tanvika takes out one candy without looking in to the bag. What is the probability that she takes out ?
(i) an orange flavoured candy.
(ii) a lemon flavoured candy.

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270. What is the probability that a number selected from the numbersl, 2,3,.........15, is a multiple of 4.

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