RS Aggarwal Class 8 Math Twenty-Five Chapter Probability Exercise 25B Solution

RS Aggarwal Class 8 Math Twenty-Five Chapter Probability Exercise 25B Solution

EXERCISE 25B

OBJECTIVE QUESTIONS

Tick (√) the correct answer in each of the following:

(1) In a spinning wheel, there are 3 white and 5 green sectors. It is spinned. What is the probability of getting a green sector?

Ans: (b) 5/8

Solution: Total number of ball = 8

Number of green ball = 5

∴ P (getting green ball) = 5/8

(2) 8 cards are numbered as 1, 2, 3, 4, 5, 6, 7, 8 respectively. They are kept in a box and mixed thoroughly. One card is chosen at random. What is the probability of getting a number less than 4?

Ans: (c) 3/8

Solution: Total number of cards = 8

Number of cards which are less than 4 = 3

∴ P (getting the numbers less than 4) = 3/8

(3) Two coins are tossed simultaneously. What is the probability of getting one head and one tail?

Ans: (b) ½

Solution: Total number of outcomes = 4

Number of such outcomes = 2

∴ P (getting one head and one tail) = 2/4 = ½.

(4) A bag contains 3 white and 2 red balls. One ball is drawn at random. What is the probability that the ball drawn is red?

Ans: (d) 2/5

Solution: Total number of balls = 5

Number of red balls = 2

∴ P (getting red balls) = 2/5

(5) A die is thrown. What is the probability of getting 6?

Ans: (b) 1/6

Solution: In throwing a die, all possible outcomes are 1, 2, 3, 4, 5, 6.

Number of all possible outcomes = 1

∴ P (getting 6) = 1/6

(6) A die is thrown. What is the probability of getting an even number?

Ans; (a) ½

Solution: In throwing a die, all possible outcomes are 1, 2, 3, 4, 5, 6.

Number of all possible even numbers = 2, 4, 6 = 3

∴ P (getting even numbers) = 3/6 = ½

(7) From a well-shuffled deck of 52 cards, one card is drawn at random. What is the probability that the drawn card is a queen?

Ans: (c) 1/13

Solution: Total number of cards = 52

Number of queen = 4

∴ P (getting queens) = 4/52 = 1/13

(8) From a well-shuffled deck of 52 cards, one card is drawn at random. What is the probability that the drawn card is a black 6?

Ans: (b) 1/26

Solution: Total number of cards = 52

Number of black 6 = 2

∴ P (getting black 6) = 2/52 = 1/26


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