# 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 = $\frac { 1 }{ 2 }$