Question

Suppose a bag of marbles has 4 green, 2 red, 5 yellow, 1 brown, and 7 blue marbles. What is the probability of picking a yellow marble, replacing it, and picking another yellow marble?

Answer 1

how many yellows we got?

Answer 2

5

Answer 3

and how many marbles we got altogether?

Answer 4

looks like 19 i think

Answer 5

so P(y) = 5/19

by replacing the marble, none of the values change in the next pick soo

P(y and y) = P(y) * P(y) = (5/19)^2