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Chapter: 9th Maths : UNIT 9 : Probability

Maths : Probability: Book Back, Exercise, Example Numerical Question with Answers, Solution: Student Activity Questions and Answers

Activity − 1

Perform the experiment of tossing two coins at a time. List out the following in the above experiment.

Random experiment:

Possible outcomes:

Sample space:

Any three subsets of S (or any 3 events) :

Perform the experiment of throwing two dice at a time. List out the following in this experiment also.

Random experiment :

Possible outcomes :

Sample space :

Any three subsets of S (or any 3 events) :

Activity − 2

Each student is asked to flip a coin 10 times and tabulate the number of heads and tails obtained in the following table.

Repeat it by tossing the coin 20, 30, 40, 50 times and find the fractions.

Activity − 3

Divide the class students into groups of pairs. In each pair, the first one tosses a coin 50 times, and the second one records the outcomes of tosses. Then prepare a table given below.

Thinking Corner

If the probability of success of an experiment is 0.4, what is the probability of failure?

Thinking Corner

For a question on probability the student’s answer was 3/2. The teacher told that the answer was wrong. Why?

Progress Check

A random experiment was conducted. Which of these cannot be considered as a probability of an outcome?

(i) 1/5 (ii) − 1/7 (iii) 0.40 (iv) − 0.52 (v) 0 (vi) 1.3 (vii) 1 (viii) 72% (ix) 107%

Progress Check

Which among the following are mutually exclusive?

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