Ncert Solutions For Class 7 Maths Ex 3.4

Ncert Solutions For Class 7 Maths Chapter 3 Ex 3.4

Q1. State whether the following events are : certain to happen, can happen but not certain or  impossible.

(i) Tomorrow will be sunny.

(ii)A tossed coin will land and stand on its edge.

(iii) Monday will follow Sunday.

(iv ) Sun will rise from the south.

(v) You will read this line again.

Answer:

(i) Can happen but not certain.

(ii) Can happen but not certain.

(iii) Certain to happen.

(iv) Impossible.

(v) Certain to happen.

 

Q2. There are 7 balls in a bag with numbers from 1 to 7 marked on them.

                (i)What is the probability of drawing a ball numbered 2?

                (ii) What is the probability of drawing a ball numbered 8?

Total number of balls = 7

(i) Number of balls numbered 2 = 1

Therefore, the probability of drawing a ball numbered 2 = 1/7

(ii) Number of balls numbered 8 = 0

Therefore, the probability of drawing a ball numbered 8 = 0/7

= 0.

 

Q3.  In a football match, a coin is tossed to decide which team starts. What is the probability that your team won’t start? Assuming head starts and your team has chosen tails.

A coin has two sides; head and tail.

Thus, the probability of getting tails = 1/2