Class 7 Maths NCERT Solutions for Chapter – 3 Data Handling EX – 3.4

Data Handling

Question 1.
Tell whether the following is certain to happen, impossible, can happen but not certain.

  1. You are older today than yesterday.
  2. A tossed coin will land heads up.
  3. A die when tossed shall land up with 8 on top.
  4. The next traffic light seen will be green.
  5. Tomorrow will be a cloudy day.

Solution:

  1. Certain to happen
  2. Can happen but not certain
  3. Impossible
  4. Can happen but not certain
  5. Can happen but not certain

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:
Out of 6 marbles, one can be drawn in 6 ways. So, total number of events = 6

(i) The marble with number 2 can be obtained only in one way.
∴ Required probability = \frac { 1 }{ 6 }

(ii) The marble with number 5 can be obtained only in one way.
∴ Required probability = \frac { 1 }{ 6 }

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

Solution:
On tossing of a coin, the possible outcomes are head (H) or tail (T).
Required probability = \frac { 1 }{ 2 }