# Probability

## Quiz by Rajashree Nambiar

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13 questions
• Q1

Someone is asked to take a number from 1 to 100. The probability that it is a prime is:

(a) 15 (b) 625 (c) 14 (d) 1350

d

b

a

c

30s
• Q2

The probability that a number selected at random from the numbers 1, 2, 3, 4, …, 15 is a multiple of 4 is

(a) 415 (b) 215 (c) 15 (d) 13

d

a

c

b

30s
• Q3

An event is very unlikely to happen. Its probability is closest to:

(a) 0.0001 (b) 0.001 (c) 0.01 (d) 0.1

c

b

d

a

30s
• Q4

If the probability of an event is P, the probability of its complementary event will be:

(a) P – 1 (b) P (c) 1 – p (d) 1 – 1p

d

a

c

b

30s
• Q5

In a family of 3 children, the probability of having atleast one boy is:

(a) 78 (b) 18 (c) 58 (d) 34

b

a

c

d

30s
• Q6

If P(A) denotes the probability of an event then:

(a) P(A) < 0 (b) P(A) > 0 (c) 0 ≤ P(A) ≤ 1 (d) -1 ≤ P(A) ≤ 0

a

d

b

c

30s
• Q7

A card is selected from a deck of 52 cards. The probability of its being a red face card is:

(a) 326 (b) 313 (c) 213 (d) 12

a

b

c

d

30s
• Q8

The probability than a non-leap year selected at random will contain 53 Sundays is:

(a) 17 (b) 27 (c) 37 (d) 57

c

d

b

a

30s
• Q9

When a die is thrown, the probability of getting an odd number less them 3 is: (a) 16 (b) 13 (c) 12 (d) 0

a

b

d

c

30s
• Q10

Question 10. A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is:

(a) 423 (b) 623 (c) 823 (d) 1723

c

b

d

a

30s
• Q11

The probability of getting a bad egg in a lot of 400 is 0.035. The number of bad eggs in the lot is: (a) 7 (b) 14 (c) 21 (d) 28

d

c

b

a

30s
• Q12

A girl calculate that the probability of her winning the first prize in a lottery is 0.08. If 6000 tickets are sold, how many tickets has she bought?

(a) 40 (b) 240 (c) 480 (d) 750

d

c

b

a

30s
• Q13

One ticket is drawn at random from a bag containing tickets numbered 1 to 40. The probability that the selected ticket has a number which is a multiple of 5 is:

(a) 15 (b) 35 (c) 45 (d) 13

c

d

a

b

30s

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