Question

A container contains 10 red rocks, 18 blue rocks, and 27 white rocks. What is the probability of selecting one red rock out of the container?

Answer 1

Our Sample size is 56 rocks total. If we want to pick one red rock out of the 56, we first have to determine the possibility of doing that from the number of red rocks we have total.

There are 10 red rocks, so the probability of picking one of those is

10/56 or 5/28

There are 18 blue rocks. So the probability of picking one of those is

18/56 or 9/28

There are 27 white rocks. So the probability of picking one of those is

27/56

Therefore, the probability of selecting one red rock out of the container is 10/56 or 5/28