Probability Class 8 Worksheets

# Probability Class 8 Worksheets

Probability Class 8 Worksheets play a major role in revising the maths concepts.

## Probability Class 8 Worksheet 1 with Answers

1. Write the sample space when two coins are tossed. Find the probability of getting at least one head.

2. Three coins are tossed simultaneously. Find the probability of the event of getting

b. two heads and one tail

c. one head and two tails

d. three tails

3. In a pack of cards, there are 52 cards. Find the probability of getting a red card.

4. There are 12 red, 8 green and 10 blue balls in a bag. One ball is drawn at random. What is the probability that the ball drawn is a

a. red ball

b. green ball

c. not a green ball?

5. If two coins are tossed together, what is the probability of getting tails on both coins?

6. Find the probability of getting a spade from a pack of 52 cards in a random experiment.

7. A bag contains 25 red, 30 yellow and 35 blue balls. A ball is taken out of the bag at random. Find the probability that the ball taken out is of

a. red colour

b. yellow colour

c. blue colour

8. A bag contains 16 pink balls, 14 green balls and 15 purple balls. Find the probability of getting a purple ball.

9. A die is rolled. Find the probability of getting a number less than 7.

10. There are 18 beads in a necklace with 5 green, 6 red, 3 black and 4 white beads. A bead is touched at random with eyes closed. Find the probability of touching

d. a green or red bead

## Probability Class 8 Worksheet 2 with Answers

1. Write the sample space when a die is thrown and find the probability of getting 2.

2. A die is rolled. Find the probability of getting

a. an even number

b. a prime number

c. a number less than 3

d. a number which is multiple of 3

3. A letter is selected at random from the set of the English alphabets: A, B, C, ... Z.

a. Write all the possible outcomes.

b. Let E be the event that the letter selected precedes J. List all the possible outcomes of this event.

c. Find P(E).

4. Three coins are tossed together. Find the probability of getting

a. three tails

b. no tail

c. at least one tail

5. An octagonal die with letters A, B, C, D, D, E, C, A written on its faces is rolled once. Find the probability that the letter turns up is

a. A             b. D

c. E            d. B

6. In a box, there are 15 cards with numbers 1 to 15. A card is selected at random from the box. Find the probability of getting

a. an even number

b. an odd number

c. a factor of 15

d. a composite number

7. A bag contains 5 red, 10 black and 15 green balls. A ball is taken out at random. Find the probability that the ball taken out is:

a. a red ball

b. a black ball

c. not a black ball

d. not a green ball.

8. A bag contains 8 white marbles, 7 red marbles and 5 blue marbles. A marble is selected at random. What is the probability that the marble is not of blue colour.

9. Chits with numbers 11 to 50 are put in a box. A chit is drawn at random. Find the probability of getting a chit with a number which is a multiple of 7.

10. A girl randomly picks a day every week to clean her room.

a. List all the possible outcomes.

b. Let F be the event that the day she picks begins with the letter ‘T’. List all the possible outcomes of this event.

c. Find P(F).

Worksheet 1

1. {HT, TH, HH, TT}; ¾

2. a. 1/8            b. 3/8

c. 3/8            d. 1/8

3. ½

4. a. 2/5          b. 4/15

c. 11/15

5. ¼                 6. ¼

7. a. 5/18       b. 1/3

c. 7/18

8. 1/3               9. 1

10. a. 5/18       b. 1/3

c. 1/6            d. 11/18

Worksheet 2

1. {1, 2, 3, 4, 5, 6}; 1/6

2. a. ½              b. ½

c. 1/3           d. 1/3

3. a. {A, B, C, D, E, ... Z}

b. {A, B, C, D, E, F, G, H, I}

c. 9/26

4. a. 1/8            b. 1/8

c. 7/8            d. 3/8

5. a. ¼             b. ¼

c. 1/8          d. 1/8

6. a. 2/5          b. 8/15

c. 4/15        d. 8/15

7. a. 1/6         b. 1/3

c. 2/3         d. ½

8. ¾

9. 3/20

10. a. {Mon, Tue, Wed, Thu, Fri, Sat, Sun}

b. {Tue, Thu}

c. 2/7

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