Question

A bag contains 3 blue marbles, 7 red marbles, and 5 yellow marbles. If Joe picks 1 marble from the bag at random, what is the probability that it will be blue?

Answer 1

You just add all the marbles which is 15 marbles. Then how many blue ones are there 3. So you just do blue out of the whole. So your answer is 3/15

Answer 2

Answer:  0.2

Step-by-step explanation:

Given : The number of blue marbles =3

The total number of marbles = $3+7+5=15$

Now, If Joe picks 1 marble from the bag at random,  then the probability that it will be blue :-

$\text{P(Blue)}=\dfrac{\text{Number of blue marbles}}{\text{Total marbles}}\\\\\=\dfrac{3}{15}=\dfrac{1}{5}=0.2$

Hence, the probability that it will be blue  = 0.2