NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.4
NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Exercise 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 8 on the top. | Impossible. |
| (iv) The next traffic light seem will be green. | Can happen but not certain. |
| (v) Tomorrow will be 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 number from 1 to 6 = 6
∴ n(S) = 6
Number of marble marked with 2=1
∴ n(E) = 1
∴ Required probability = \(\frac{n(\mathrm{E})}{n(\mathrm{S})}=\frac{1}{6}\)
(ii) Number of marble marked with 5 = 1
∴ n(E) = 1
∴ Required probability = \(\frac{n(\mathrm{E})}{n(\mathrm{S})}=\frac{1}{6}\)
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:
Coin has 2 faces—Head (H) and Tail (T)
∴ Sample space S(n) = 2
Number of successful event n(E) = 1
∴ Required probability = \(\frac{n(\mathrm{E})}{n(\mathrm{S})}=\frac{1}{2}\)
| Sample Space: The sample space of an experiment is the number of all possible outcomes of that experiment. |
