### Home > CC2 > Chapter 2 > Lesson 2.1.1 > Problem2-15

2-15.

Thomas has a bag with $7$ green marbles, $5$ blue marbles, and $4$ red marbles. For each part below, if the marble selected is replaced before the next marble is drawn, find the probability for the given draw. Write your answer as a fraction, as a decimal, and as a percent.

1. A red marble?

Remember that probability can be written as a fraction:

$\large\frac{\text{number of successful outcomes}}{\text{number of possible outcomes}}$

How many red marbles are there? How many total marbles?

$\frac{4}{16}=\frac{1}{4}$

2. A red or a green marble?

See part (a).

3. An orange marble?

How many orange marbles are in the bag?