NCERT MATHS SOLUTION CLASS 7 EXERCISE 3.4 | DATA HANDLING

Find here step-by-step NCERT Maths Solution Class 7 Exercise 3.4 Chance & Probability | Chapter 3 Data Handling from CBSE NCERT textbook.

Before moving to maths solution class 7 exercise 3.4 , it is advised to go through the following topics:
• Data Handling

NCERT Maths Solution Class 7 Exercise 3.4 | Data Handling

Problems in Exercise 3.4 require the knowledge of Chance and Probability.

Events that have many possibilities can have probability between 0 and 1.

Those events which have no chance of happening have probability 0 and those that are bound to happen have probability 1.

Exercise 3.4
Chance & Probability

QUESTION 1

Tell whether the following is certain to happen, impossible, can happen but not certain.

(i) You are older today than yesterday.

(ii) A tossed coin will land heads up.

(iii) A die when tossed shall land up with 8 on top.

(iv) The next traffic light seen will be green.

(v) Tomorrow will be a cloudy day.

ANSWER

(i) It is certain to happen.

(ii) It can happen but not certain.

(iii) It is impossible.

(iv) It can happen but not certain.

(v) It can happen but not certain.


• Age certainly increases day by day.

• Tossed coin can land head up or tail up.

• A die has only six faces marked from 1 to 6.

• A traffic light signals through 3 clours consecutively each for fixed amount of time.

• Nature of clouds on a certain day depend on the weather of an area.

[ NCERT MATHS SOLUTION CLASS 7 EXERCISE 3.4 ]


QUESTION 2

There are 6 marbles in a box with numbers from 1 to 6 marked on each of them.

(i) What is the probability of drawing a marble with number 2?

(ii) What is the probability of drawing a marble with number 5?

ANSWER

Chances of drawing each marble are equal.

Total number of possible outcomes = 6

(i) The probability of drawing a marble with number 2,

P = \frac{1}{6}

(ii) The probability of drawing a marble with number 5,

P = \frac{1}{6}


Probability = \frac{Number\, of\, Outcomes\, that\, make\, an\, event}{Total\, Number\, of\,Possible\, Outcomes}

[ NCERT MATHS SOLUTIONS CLASS 7 EXERCISE 3.4 ]


QUESTION 3

A coin is flipped to decide which team starts the game. What is the probability that your team will start?

ANSWER

A coin has two possible outcomes Head and Tail.

Chances of getting Head or Tail are equal,

P (head or tail) = \frac{1}{2}

Therefore, whatever side of coin the team choose, the probability to start is \frac{1}{2}.

NCERT MATHS SOLUTION | CLASS 7 | CHAPTER 3 | DATA HANDLING

Exercise 3.1 | Exercise 3.2

Exercise 3.3 | Exercise 3.4

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