You are drawing colored marbles from a bag. The bag contains 5 red, 4 blue, 6 green and 5 yellow marbles. What is the probability you will NOT draw a blue marble?

Answer 1

1 - 4/20 = 16/20 = 80%

Calculate the probability of drawing a blue, then subtract from 100%

4 ways to get a blue out of 20 total marbles

4/20 = .20 = 20%

100%-20% = 80%