The urn contains 20 green, 10 black, 25 yellow and 15 white balls. They took out one ball.

The urn contains 20 green, 10 black, 25 yellow and 15 white balls. They took out one ball. Find the probability that the ball taken out is green.

1. Let’s calculate how many balls are in the urn if from the problem statement we know that there are 20 green, 10 black, 25 yellow and 15 white balls in it. To do this, we need to find the sum of all these values.

20 + 10 + 25 + 15 = 70 balls.

2. Now let’s determine what is the probability that a ball taken out at random from the urn will turn out to be green. To do this, you need to divide the number of green balls by the total number of balls in the urn.

p = 20/70 = 0.286.

Answer: The probability that a ball taken out at random from the urn will turn out to be green is 0.286.