#### Chapters

Chapter 2: Rational Numbers

Chapter 3: Fractions (Including Problems)

Chapter 4: Decimal Fractions (Decimals)

Chapter 5: Exponents (Including Laws of Exponents)

Chapter 6: Ratio and Proportion (Including Sharing in a Ratio)

Chapter 7: Unitary Method (Including Time and Work)

Chapter 8: Percent and Percentage

Chapter 9: Profit, Loss and Discount

Chapter 10: Simple Interest

Chapter 11: Fundamental Concepts (Including Fundamental Operations)

Chapter 12: Simple Linear Equations (Including Word Problems)

Chapter 13: Set Concepts (Some Simple Divisions by Vedic Method)

Chapter 14: Lines and Angles (Including Construction of angles)

Chapter 15: Triangles

Chapter 16: Pythagoras Theorem

Chapter 17: Symmetry (Including Reflection and Rotation)

Chapter 18: Recognition of Solids (Representing 3-D in 2-D)

Chapter 19: Congruency: Congruent Triangles

Chapter 20: Mensuration

Chapter 21: Data Handling

Chapter 22: Probability

## Chapter 22: Probability

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

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

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

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

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

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:

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

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

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

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:**(i)** two heads**(ii) **exactly one head**(iii) **no head.

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

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

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

A die is thrown, find the probability of getting:

a number greater than 4

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

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

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

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

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

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

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’)

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.

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

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

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

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

## 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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