Question

You randomly choose a marble from a bag of 7 green marbles and 4 blue

marbles. You replace the marble and draw another.
You choose a green marble, then you choose a blue marble.
What is the probability that you choose a green marble?
What is the probability that you choose a blue marble?
What is the probability that you choose a green marble AND then a blue marble?

Answer 1

Chance of green = 2/3

Chance of blue = 1/3

Chance of green then blue = 0.222...

Explanation:

7-1=6; 4-1=3

6+3=9

Chance of green = 6/9 or 2/3

Chance of blue = 3/9 or 1/3

Chance of green then blue = 2/3 * 1/3 = 0.222...