Question

in a bag I have 16 yellow marbles, 14 by marbles and 10 black marbles. If I draw to marbles, one at a time, what’s my probability of drawing a black marble, putting it back and then choosing a yellow marble

Answer 1

1/10

Explanation:

There are 16+ 14+10 = 40 marbles

P( black) = black/total = 10/40 = 1/4

We put it back

There are 16+ 14+10 = 40 marbles

P( yellow) = yellow/ total = 16/40 = 2/5

Multiply the probabilities together

P( black, yellow) = 1/4 * 2/5

= 2/20 = 1/10