Question

A box contains 19 balls bearing numbers 1, 2, 3, ..., 19. A ball is drawn at random from the box. What is the probability that the number of the ball is an even number?

Answer 1

Given: A box contains balls numbered 1, 2, ..., 19.

Step-wise calculation:

1. Total number of outcomes = 19 one for each ball.

2. Even numbers between 1 and 19 are 2, 4, 6, ..., 18. Count = 9.

3. Probability = `"Number of favourable outcomes"/"Total outcomes"`

= `9/19`

The probability that the drawn ball’s number is even is `9/19`.