# Selina solutions for Concise Mathematics Class 7 ICSE chapter 22 - Probability [Latest edition]

## Chapter 22: Probability

Exercise 22 (A)Exercise 22 (B)
Exercise 22 (A)

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 22 ProbabilityExercise 22 (A)

Exercise 22 (A) | Q 1.1

A coin is tossed once. Find the probability of getting a head

Exercise 22 (A) | Q 1.2

A coin is tossed once. Find the probability of not getting a head

Exercise 22 (A) | Q 2.1

A coin is tossed 80 times and the head is obtained 38 times. Now, if a coin tossed once, what will the probability of getting a tail

Exercise 22 (A) | Q 2.2

A coin is tossed 80 times and the head is obtained 38 times. Now, if a coin tossed once, what will the probability of getting a  head

Exercise 22 (A) | Q 3

A dice is thrown 20 times and the outcomes are noted as shown below:

 Outcomes 1 2 3 4 5 6 No. of times 2 3 4 4 3 4

Now a dice is thrown at random, find the probability of getting:

Exercise 22 (A) | Q 4

A survey of 50 boys showed that 21 like tea while 29 dislike it. Out of these boys, one boy is chosen at random. What is the probability that the chosen boy
(i) likes tea
(ii) dislikes tea

Exercise 22 (A) | Q 5

In a cricket match, a batsman hits a boundary 12 times out of 80 balls he plays, further, if he plays one ball more, what will be the probability that:
(i) he hits a boundary
(ii) he does not hit a boundary

Exercise 22 (A) | Q 6

There are 8 marbles in a bag with numbers from 1 to 8 marked on each of them. What is the probability of drawing a marble with a number
(i) 3
(ii) 7

Exercise 22 (A) | Q 7

Two coins are tossed simultaneously 100 times and the outcomes are as given below:

 Outcomes Two heads(H, H) Exactly one head(H T or T H) No head(T T) No. of times 21 55 24

If the same pair of coins is tossed again at random, find the probability of getting:

Exercise 22 (A) | Q 8

A bag contains 4 white and 6 black balls,- all of the same shape and same size. A ball is drawn from the bag without looking into the bag. Find the probability that the ball drawn is:
(i) a black ball
(ii) a white ball
(iii) not a black ball

Exercise 22 (A) | Q 9.1

In a single throw of a dice, find the probability of getting a number 4

Exercise 22 (A) | Q 9.2

In a single throw of a dice, find the probability of getting a number 6

Exercise 22 (A) | Q 9.3

A die is thrown, find the probability of getting:

a number greater than 4

Exercise 22 (A) | Q 10.1

Hundred identical cards are numbered from 1 to 100. The cards are well shuffled and then a card is drawn. Find the probability that the number on the card drawn is 50

Exercise 22 (A) | Q 10.2

Hundred identical cards are numbered from 1 to 100. The cards are well shuffled and then a card is drawn. Find the probability that the number on the card drawn is 80

Exercise 22 (A) | Q 10.3

Hundred identical cards are numbered from 1 to 100. The cards are well shuffled and then a card is drawn. Find the probability that the number on the card drawn is 40

Exercise 22 (B)

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 22 ProbabilityExercise 22 (B)

Exercise 22 (B) | Q 1.1

Suppose S is the event that will happen tomorrow and P(S) = 0.03. State in words, the complementary event S’.

Exercise 22 (B) | Q 1.2

Suppose S is the event that will happen tomorrow and P(S) = 0.03. Find P(S’)

Exercise 22 (B) | Q 2

Five Students A, B, C, D, and E are competing in a long-distance race. Each student’s probability of winning the race is given below:
A → 20%, B → 22%, C → 7%, D → 15% and E → 36%
(i) Who is most likely to win the race?
(ii) Who is least likely to win the race?
(iii) Find the sum of probabilities given.
(iv) Find the probability that either A or D will win the race.
(v) Let S be the event that B will win the race.
(a) Find P(S)
(b) State, in words, the complementary event S’.
(c) Find P(S’)

Exercise 22 (B) | Q 3

A Ticket is randomly selected from a basket containing 3 green, 4 yellow, and 5 blue tickets. Determine the probability of getting:
(i) a green ticket
(ii) a green or yellow ticket.
(iii) an orange ticket.

Exercise 22 (B) | Q 4

Ten cards with numbers 1 to 10 written on them are placed in a bag. A card is chosen from the bag at random. Determine the probability of choosing:
(i) 7
(ii) 9 or 10
(iii) a number greater than 4
(iv) a number less than 6

Exercise 22 (B) | Q 5

A carton contains eight brown and four white eggs. Find the probability that an egg selected at random is:
(i) brown
(ii) white

Exercise 22 (B) | Q 6

A box contains 3 yellow, 4 green, and 8 blue tickets. A ticket is chosen at random. Find the probability that the ticket is:
(i) yellow
(ii) green
(iii) blue
(iv) red
(v) not yellow

Exercise 22 (B) | Q 7

The following table shows number of males and number of females of a small locality in different age groups.

 Age in years 10-20 21-50 Above 50 Male 8 12 6 female 6 10 4

If one of the persons, from this locality, is picked at random, what is the probability that
(a) the person picked is a male?
(b) the person picked is a female?
(c) the person picked is a female aged 21-50?
(d) the person is a male with age up to 50 years?

## Chapter 22: Probability

Exercise 22 (A)Exercise 22 (B)

## Selina solutions for Concise Mathematics Class 7 ICSE chapter 22 - Probability

Selina solutions for Concise Mathematics Class 7 ICSE chapter 22 (Probability) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Mathematics Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Mathematics Class 7 ICSE chapter 22 Probability are Basic Ideas of Probability, Concept for Feel of Probability Using Data Through Experiments., Concept for Notion of Chance, Concept for Tabulating and Counting Occurrences, Comparing the Observation with that for a Coin. Observing Strings of Throws, Notion of Randomness..

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