EXERCISE 3.4
Q 1, Ex 3.4 - Data Handling - Chapter 3 - Maths Class 7th - NCERT
Page No 76:
Question 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.
Answer:
(i) Certain(ii) Can happen but not certain
- Impossible as there are only six faces on a dice marked as 1, 2, 3, 4, 5, 6 on it.
(v) Can happen but not certain
Q 2, Ex 3.4 - Data Handling - Chapter 3 - Maths Class 7th - NCERT
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?
Answer:
(i) Probability =
P (appearance of 2) =
(ii) P (appearance of 5) =
Q 3, Ex 3.4 - Data Handling - Chapter 3 - Maths Class 7th - NCERT
Question 3:
A coin is flipped to decide which team starts the game. What is the probability that your team will start?Answer:
A coin has two faces − Head and Tail. One team can opt either Head or Tail.Probability =
Probability (our team starts first) =
Q 4, Ex 3.4 - Data Handling - Chapter 3 - Maths Class 7th - NCERT
Question 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?Answer:
It can be observed that while closing the eyes, one can draw either a black sock or a white sock. Therefore, there are two possible cases.Probability =
Probability (a pair of white socks will be formed) =
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