Samantha has a bag of marbles containing pink marbles,
orange marble,
red marbles,
purple marbles,
white marbles,
black marble,
green marbles, and
yellow marble. What is the probability that Samantha will pick a red marble out of the bag?
(correct answer)
Explanation: In this problem we have a total of marbles. That means that each marble, regardless of color, has a
chance of being picked, as shown in the images below. This image shows equal probability because each marble has a
chance of being drawn, which is equal to the probability of all of the other marbles.
Samantha wants to know what her probability is of drawing a red marble out of her bag. Remember, probability is the number of favorable outcomes over the total number of outcomes:
For this problem there are
red marbles; therefore,