Question

30 points? Answer and explanation​

Answer 1

`\large\boxed{(4)/(5)=0.8}`

Explanation:

We have:

10 - number of all marbles

4 + 3 + 1 = 8 - number of non-white marbles

The probability:

`(non-white)/(all)=(8)/(10)=(8:2)/(10:2)=(4)/(5)`