Question

a box contains 4 red marbles, 5 white marbles, and 9 blue marbles. if a marble is randomly selected from the box, what is the probability that it is blue? express your answer as a fraction.

Explanation:

Step1: Calculate total marbles

Total marbles = 4 (red) + 5 (white) + 9 (blue) = 18.

Step2: Calculate probability of blue

Probability = Number of blue marbles / Total marbles = $\frac{9}{18}$ = $\frac{1}{2}$.

Answer:

$\frac{1}{2}$