## 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.**

Answer:

(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?**

Answer:

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?**

Answer:

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?**

Answer: Two outcomes i.e. either Head or Tail.

**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

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