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RD Chapter 13 Probability Ex 13.1 Solutions

Question - 21 : -
A game of chance consists of spinning an arrow which is equally likely to come to rest pointing to one of the number, 1, 2, 3,………12 as shown in the figure. What is the probability that it will point to:
 
(i) 10?
(ii) an odd number?
(iii) a number which is multiple of 3?
(iv) an even number?

Answer - 21 : -


Question - 22 : -
In a class, there are 18 girls and 16 boys. The class teacher wants to choose one pupil for class monitor. What she does, she writes the name of each pupil on a card and puts them into a basket and mixes thoroughly. A child is asked to pick one card from the basket. What is the probability that the name written on the card is: .
(i) the name of a girl
(ii) the name of a boy?

Answer - 22 : -


Question - 23 : - Why is tossing a coin considered to be a fair way of deciding which team should choose ends in a game of cricket ?

Answer - 23 : - When we toss a coin, there are two outcomes of being a head and a tail equally So, the result of an individual coin toss is complelery are predictable. That is why, coin is tossed to decide which team should choose the end for the game

Question - 24 : - What is the probability that a number selected at random from the number 1, 2,2,3,3,3,4,4,4,4 will be their average?

Answer - 24 : -


Question - 25 : - There are 30 cards, of same size, iiTa bag on which numbers 1 to 30 are written. One card is taken out of the bag at random. Find the probability that the number on the selected card is not divisible by 3. [CBSE 2005]

Answer - 25 : -


Question - 26 : - A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is (i) red or white (ii) not black (iii) neither white nor black. [CBSE 2005]

Answer - 26 : -


Question - 27 : - Find the probability that a number selected from a number 1 to 25 is not a prime number when each of the given numbers is equally likely to be selected. [CBSE 2005]

Answer - 27 : -


Question - 28 : -
A bag contains 8 red, 6 white and 4 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is
(i) red or white
(ii) not black
(iii) neither white nor black.

Answer - 28 : -


Question - 29 : -
Find the probability that a number selected at random from the numbers 1, 2, 3,….. , 35 is a
(i) prime number
(ii) multiple of 7
(iii) a multiple of 3 or 5 [CBSE 2006C]

Answer - 29 : -


Question - 30 : -
From a pack of 52 playing cards Jacks, queens, kings and aces of red colour, are removed. From the remaining, a card is drawn at random. Find the probability that the card drawn is
(i) a black queen
(ii) a red card
(iii) a black jack
(iv) a picture card (Jacks, queens and kings are picture cards).

Answer - 30 : -


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