Question

Giving medals and fan....!Please help...
Paul has a bag containing 10 marbles. Seven of the marbles are black and 3 of the marbles are blue.

What is the probability of selecting a black marble if Paul already selected a blue marble without replacement? Round your answer to the nearest hundredth.

Answer 1

If Paul already took a blue one, that means there's 7 black ones and 2 blue ones left, meaning there's 9 total marbles. The probability of him selecting a black marble is the number of black marbles over the total number of marbles, or 7/9
If you type this into a calculator, it'll give you 0.777 as answer.
Now, I'm not sure, but since you asked for probability, I'm guessing this number has to be a percentage, which becomes 77.77%

Answer 2

i was gonna say 0.77 or like he said 7/9