EXTRA QUESTIONS CLASS X CH-14 PROBABILITY

(1-2 MARK QUESTIONS)

Q.1) A box contains cards numbered 11 to 123 . A card is drawn at random from the box. Find the probability of the number on the drawn card is 

(a) a square number

(b) a multiple of 7 

Q.2) A box contains 12 balls of which some are red in colour. If 6 more red balls are put in the box and a ball is drawn at random, the probability of drawing a red ball doubles than that what it was before. Find the number of red balls in the bag.

Q.3) A die is drawn once. Find the probability of getting

1.) A prime number 

2.) An odd number

3.) A number lying between 2 and 6.

Q.4) In a single throw of a pair of different dice , what is the probability of getting

(a) a prime number on each dice 

(b) a total of 9 and 11

Q.5) Cards marked with the number 3,4,5....50 are placed in a box and mixed thoroughly. A card is drawn at random from the box. Find the probability that the selected card bears a perfect square.

Q.6) Three different coins are tossed together. Find the probability of getting (a) exactly two heads

(b) at least two heads

(c) at least two tails

Q.7) A card is drawn at random from a well shuffled pack of 52 playing cards . Find the probability of getting neither a red card nor a queen.

Q.8) A number is chosen at random from the numbers -3,-2,-1,0,1,2,3. What is the probability that square of this number is less than or equal to 1?

Q.9) The probability of getting a rotten apple randomly from a heap of 900 apples is 0.18 . What is the number of rotten apples in a heap?

Q.10) A box contains 150 oranges , if one orange is taken out from the box at random and the probability of its being rotten is 0.06 , then find the number of good oranges in the box.

Q.11) A box contains 5 red marbles , 8 white marbles and 4 green marbles . One marble is taken out of the box at random. What is the probability that the marble takes out will be not red.

Q.12) It is given that in a group of 3 students, the probability of 2 students not having the same birthday is 0.992.  What is the probability that the 2 students have the same birthday?

Q.13) Rahim tosses two different coins simultaneously. Find the probability of getting at least one tail.

Q.14) A game consist of tossing a one rupee coin 3 times and noting the outcome each time. Ramesh will win the game if all the tosses show the same result and loses otherwise. Find the probability that Ramesh will lose the game.

Q.15) Find the probability of getting 53 Fridays in a leap year.

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