Question

An urn contains 10 red balls, 20 yellow balls, and 60 orange balls. If you reach into the urn and select a single ball at random, what is the probability of selecting a red ball? State your answer as a fraction.

Answer 1

From the problem, there are 10 red balls, 20 yellow balls and 60 orange balls.

The probability of selecting an item is

$p=\frac{\text{event}}{\text{total events}}$

Total events is the number of total balls in the urn.

Total events = 10 + 20 + 60 = 90

The probability of selecting a red ball, the event is the number of red balls, event = 10

$p=\frac{10}{90}=\frac{1}{9}$

The answer is p = 1/9