Question

A bag has 7 red marbles, 8 blue marbles and 3 black marbles. What is the probability of picking a blue marble, replacing it, and then picking a black marble?

Answer 1

@iGreen

Answer 2

Add up to find the total amount. 7 + 8 + 3 = ?

Answer 3

18

Answer 4

Yes, and what's the probability of picking a blue marble?

Answer 5

i got 8/18 for the first one… but then do i just add 3/18 to that?

Answer 6

No, we multiply.

\(\dfrac{8}{18} \times \dfrac{3}{18} =~?\)

Answer 7

simplified out to 2/27

Answer 8

Yep!