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Detailed Solutions for NCERT Class 7th Mathematics Chapter 3 -Data Handling Exercise 3.4

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Please find the detailed Solutions for class 7th Maths Chapter 3 -Data Handling Exercise 3.4 Solutions, you can check all the solutions from here chapter wise

NCERT Class 7th Mathematics Chapter 3 -Data Handling Exercise 3.4 Solutions

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.

Sol: (i) Certain to happen

(ii) Can happen but not certain

Because when a coin is tossed probability of head and tail is equal.

(iii) Impossible. Because a die has 6 faces marked 1, 2, 3, 4, 5 and 6.

(iv) Can happen but not certain.

(v) Can happen but not certain.


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?

Sol: Probability = No. of favorable outcomes / Total no. of outcomes

(i) Probability of marble with number 2, P (2) = 1/6

(ii) Probability of marble with number 5, P (5) = 1/6

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

Sol: A coin has two faces – Head and Tail. One team will choose Head and the other will choose tail.

Probability = Favorable outcome / Total no. of outcomes

Probability that our team will start = 1 / 2                     

4. A box contains pairs of socks of two colours (black and white). I have picked out a
white sock. I pick out one more with my eyes closed. What is the probability that it
will make a pair?

Sol: Probability = No. of favorable outcomes / No. of possible outcomes

While the eyes are closed one can pick either a white sock or a black sock. So there are two possible outcomes.

Probability (it will make a pair) = 1 / 2

You can find the solutions for previous exercise from here

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