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Mathematics
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Unit 6-Statistics and Probability
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Probability Worksheets

1.

11 defective bulbs are accidentally mixed with 121 good ones. One ball is taken out at random from

this lot. Find the probability that the ball taken out is a good one.

this lot. Find the probability that the ball taken out is a good one.

1. 1/12
2. 7/12
3. 11/12
4. 1/11

2.

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 a perfect square number.

3.

Five cards—the ten, jack, queen, king and ace of diamonds, are well-shuffled with their face downwards. One card is then picked up at random. What is the probability that the card is the queen?

4.

Choose the correct option: A three digit number is formed by the digits 1, 2 and 3 with no digit being repeated. The probability that it will be an even number is _____.

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

5.

Choose the correct option: Ramesh has 5 yellow, 4 green and 7 blue balls in a bag. The probability that the randomly selected ball is green is ______.

1. 7/16
2. 9/16
3. 1/4
4. 3/4

6.

What is the probability that a number selected from numbers (1,2,3,…………,15) is a multiple of 5?

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

7.

Cards, marked with numbers 5 to 50, are placed in a box and mixed thoroughly. A card is drawn from the box out random. Find the probability that the number on the taken card is an even number less than 10.

1. 2/23
2. 1/23
3. 3/46
4. None of these

8.

What is the probability that two persons have the same birthday?

1. 1/365
2. 364/365
3. 2/365
4. None of these

9.

A card is drawn at random from a well-shuffled deck of playing cards. Find the probability that the card drawn is a red queen.

1. 1/13
2. 1/52
3. 2/13
4. 1/26

10.

If a coin is tossed 3 times. What is the probability of occurrence of three heads?

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

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