Question

Question #c9523

Answer 1

`3/10`

Explanation:

The probability of a blue is the number of blue marbles, divided by the total number of marbles.
We write "the probability of blue" as `P(B)`.

`P(B)=3/(2+3+5)`
`=3/10`

You can also write this as `0.3` or `30%`, but generally I prefer sticking to fractions (its easier to add and multiply them).