Example 1 · level 1
A spinner has 4 equal parts numbered 1 to 4. What is the probability that it stops on an even number? (answer as a fraction)
Show solution
- Even numbers from 1 to 4: 2, 4 (2 of them) out of 4.
- Probability = 2/4 = 1/2.
Answer: 1/2
CLASS 8 MATHS · DATA HANDLING
Probability of simple events
Probability = number of favourable outcomes ÷ total number of equally likely outcomes.
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Worked examples
Example 2 · level 2
A bag at a Durga Puja fair has 6 red, 8 blue and 5 green balls. One ball is drawn at random. What is the probability that it is red? (answer as a fraction)
Show solution
- Total balls = 6 + 8 + 5 = 19. Red balls = 6.
- Probability = 6/19.
Answer: 6/19
Example 3 · level 3
Cards numbered 1 to 25 are shuffled and one is picked at random. What is the probability that the number is a multiple of 5? (answer as a fraction)
Show solution
- Multiples of 5 up to 25: 5, 10, … , 25, which is 5 cards out of 25.
- Probability = 5/25 = 1/5.
Answer: 1/5