NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.4

NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.4 are the part of NCERT Solutions for Class 7 Maths. Here you can find the NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.4.

Ex 3.4 Class 7 Maths Question 1.

Tell whether the following situations are certain to happen, impossible to happen, can happen but not certain.
(i) You are older today than yesterday.
(ii) A tossed coin will land heads up.
(iii) A dice 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.

Solution:

Event	Chance
(i) You are older today than yesterday.	Certain to happen.
(ii) A tossed coin will land heads up.	Can happen but not certain.
(iii) A dice when tossed shall land up with 8 on the top.	Impossible to happen.
(iv) The next traffic light seen will be green.	Can happen but not certain.
(v) Tomorrow will be a cloudy day.	Can happen but not certain.

Ex 3.4 Class 7 Maths 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?

Solution:
(i) Total number of marbles marked with the numbers from 1 to 6 = 6
∴ n(S) = 6
Number of marble marked with number 2 = 1
∴ n(E) = 1
∴ Required probability = n(E)/n(S) = 1/6

(ii) Number of marble marked with number 5 = 1
∴ n(E) = 1
∴ Required probability = n(E)/n(S) = 1/6

Ex 3.4 Class 7 Maths Question 3.

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

Solution:
A coin has 2 faces—Head (H) and Tail (T).
∴ Sample space n(S) = 2
Number of successful event n(E) = 1
∴ Required probability = n(E)/n(S) = ½