Question

A bag contains 8 blue marbles, 6 green marbles, 12 yellow marbles, and 10 orange marbles. A marble is drawn at random from the bag.


What is the probability that the marble drawn will not be blue?

A.2/9


B.3/4


C.7/9


D.7/8

Answer 1

What is the total number of marbles in the bag?

Answer 2

36

Answer 3

Good.
How many are not blue?

Answer 4

28

Answer 5

Good.
The probability of an event occurring is the number of ways the event can occur divided the total number of results possible.

Here, the total number of results is 36 since you can take any of 36 marbles.
You are interested in 28 ways of taking a non blue marble.

P(not blue) = (number not blue)/(total number)