Probability Quiz

A Class IX English book contains 200 pages. A page is selected at random. What is the probability that the number on the page is divisible by 10?

1. 1/100
2. 3/10
3. 1/10
4. 1/50

Answer: (c) 1/10

A die is thrown twice. What is the probability of the sum being odd?

1. 1/8
2. 19/36
3. 5/18
4. 1/2

Answer: (d) 1/2

In a cricket match, Warne took three wickets in every 27 balls that he bowled. Find the probability of a batsman not getting out by Warne’s bowling.

1. 2/3
2. 8/9
3. 1/8
4. 2/9

Answer: (b) 8/9

Three coins are tossed 100 times and three heads occurred 25 times, two heads occurred 38 times, one head occurred 14 times and head did not occur 23 times. Find the probability of getting more than one head.

1. 1/10
2. 18/50
3. 63/100
4. 16/100

Answer: (c) 63/100

This Venn diagram shows the number of people who enjoy holidays at the beach and at the snow. What is the probability of people who did not enjoy the snow?

1. 3/5
2. 1/5
3. 13/30
4. 9/20

Answer: (d) 9/20

Sam asked 50 people whether they liked vegetable pizza or pepperoni pizza. 37 people like vegetable pizza, 25 people like both, 3 people like neither. Sam picked one of the 50 people at random. Given that the person he chose likes pepperoni pizza, find the probability that they don’t like vegetable pizza.

1. 3/7
2. 3/35
3. 2/7
4. 2/9

Answer: (c) 2/7

An integer is chosen at random from the first two hundred positive integers. What is the probability that the integer chosen is divisible by 6 or 8?

1. 1/4
2. 1/8
3. 2/5
4. 3/6

Answer: (a) 1/4

x = ABCDEFGHIJ … Z. Find the probability of a letter selected from those in odd positions of x being a vowel.

1. 6/13
2. 5/18
3. 2/13
4. 5/13

Answer: (d) 5/13

A jar contains 54 marbles each of of which is blue, green or white. The probability of selecting a blue marble at random from the jar is 1/3 and the probability of selecting a green marble at random is 4/9. How many white marbles does the jar contain?

1. 6
2. 12
3. 18
4. 30

Answer: (b) 12

Read the passage and answer the following question: A local gym conducted a survey on 2000 members to study the relationship between age groups and the number of workout sessions attended in a month. The data collected is presented in the following table. Find the probabilities of having attended no workout sessions in a month. Age of Members (in years) 0 sessions 1-5 sessions 6-10 sessions 11-15 sessions Over 15 sessions 18-29 480 170 100 80 30 30-50 530 140 90 70 40 Above 50 370 60 45 25 10

1. 69/100
2. 29/100
3. 59/50
4. 19/50

Answer: (a) 69/100