Page 86 - Mathematics Class - X

MCQs

1. Which of the following cannot be the probability of an event?
a) 1/3 b) 0.1 c) 3 % d) 17/16
2. An event is very unlikely to happen. Its probability is closest to

a) 0.0001 b) 0.001 c) 0.1 d) 1.0
3. If the probability of an event is p, the probability of its complementary event will be
a) p – 1 b) 1 – p c) p d) 1 –1/ p
4. When a die is thrown, the probability of getting an odd number less than 3 is
a) 1/6 b) 1/2 c) 1/3 d) 0

5. Someone is asked to take a number from 1 to 100. The probability that it is a prime is
a) 1/5 b) 6/25 c) 1/4 d) 13/50

Answers: 1. d) 17/16 2. a) 0.0001 3. b) 1 – p

4. a) 1/6 5. c) 1/4

Case-Study Based Questions
Case-Study Based Questions

Two friends Neha and Mohan have some saving in their Piggy Bank.
They decided to count the total coins they both had. After counting they
find that they have fifty ` 1 coins, forty-eight ` 2 coins, thirty-six ` 5 coins,
twenty-eight ` 10 coins and eight ` 20 coins. Then, they asked Renu, their
another friend, to choose a coin randomly. Find the probability that the coin
choosen is:
1. ` 5 coin.

17 36 18 1
(a) (b) (c) (d)
55 85 85 15
2. ` 20 coin.

13 4 3 4
(a) (b) (c) (d)
85 85 85 15

3. Not a ` 10 coin.
14 71 95 95
(a) (b) (c) (d)
85 85 170 170

4. ` 10 and ` 20 both.
20 18 71 3
(a) (b) (c) (d)
85 85 85 85

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