Question

A bag contains 4 white balls, 5 red balls and 8 black balls and 3 blue balls. A ball is drawn at random from the bag. Find the probability that the ball drawn is not black.

Answer 1

Given: A bag contains 4 white, 5 red, 8 black and 3 blue balls.

Step-wise calculation:

1. Total number of balls

= 4 + 5 + 8 + 3

= 20

2. Number of non-black balls

= Total – Black 

= 20 – 8

= 12

3. Probability (not black)

= `"Favourable"/"Total"` 

= `12/20`

= `3/5`

= 0.6

The probability that the ball drawn is not black is `3/5` or 0.6.