## Data Handling

EXERCISE 3.4
CBSE Class 7 Maths

Q1: 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.

(i) It is certain to happen.
(ii) It can happen but not certain.
(iii)It is impossible.
(iv) It can happen but not certain.
(v)  It can happen but not certain.

Q2: 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?

Total marbles from 1 to 6 marked in a box = 6
(i) The probability of drawing a marble with number 2.
P (drawing one marble) = ⅙

(ii) The probability of drawing a marble with number 5.
P (drawing one marble) = ⅙

Q3: A coin is flipped to decide which team starts the game. What is the probability that your team will start?

A coin has two possible outcomes Head and Tail.
Probability of getting Head or Tail is equal.
P (Starting game) =  ½

Other Questions:

Q4: A 5₹ coin is tossed, what are the possible outcomes?

Q5: A box of 600 electric bulbs contains 12 defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non defective bulb?

Answer: Total electric bulbs = 600
Defective bulbs = 12
Non Defective bulbs = 600 - 12 = 588

P (picking up non-defective bulb) = Non Defective bulbs ÷ Total bulbs = 588 ÷ 600 = 0.98