Question

there are three red marbles, seven blue marbles, and five yellow. you select a marble randomly. find the probabilities below
c. p(blue marble)
d. p(not red)

Explanation:

Step1: Calculate total number of marbles

$3 + 7+5=15$

Step2: Calculate $P(\text{blue marble})$

The number of blue marbles is 7. So $P(\text{blue marble})=\frac{7}{15}$

Step3: Calculate $P(\text{not red})$

The number of non - red marbles is $7 + 5=12$. So $P(\text{not red})=\frac{12}{15}=\frac{4}{5}$

Answer:

c. $\frac{7}{15}$
d. $\frac{4}{5}$