Page 312 - Start Up Mathematics_7

Some NCERT Textbook Questions

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 and up with 8 on top.

(iv) The next traffic light seen will be green. (v) Tomorrow will be the cloudy day.
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?

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

Exemplar Problems

1. On tossing a coin, the outcome is:

(a) only head (b) only tail
(c) neither head nor tail (d) either head or tail
2. In a school, only 2 out of 5 students can participate in a quiz. What is the chance that a student
picked at random makes it to the competition?

(a) 20% (b) 40% (c) 50% (d) 30%

3. When a die is thrown, the probability of getting a number less than 7 is _________.
4. In throwing a die the number of possible outcomes is _________.
5. The probability of getting an ace out of a deck of cards is greater than 1. (True/False)

6. If a die is thrown, the probability of getting a number greater than 6 is 1. (True/Fase)

7. The letters written on paper slips of the word MEDIAN are put in a bag. If one slip is drawn
randomly, what is the probability that it bears the letter D?
8. Following cards are put facing down:

A E I O U

What is the chance of drawing out:

(a) a vowel (b) A or I

(c) a card marked U (d) a consonant

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