Question

There are 3 red marbles, 4 white marbles, and 1 green marble in a bag. Marbles are drawn without replacement. What is the probability that 3 marbles can be drawn without drawing the green marble?

0.625
0.643
0.670
0.998
0.179

Answer 1

.670 because there are 8 total marbles, which means that 7 out of the 8 marbles in the bag are not green. So, the probability of not drawing a green marble is 7/8. To draw 3 marbles that aren't green, you multiply 7/8 * 7/8 * 7/8 , which = .670. Hope that helps!

Answer 2

ah wow thanks :)

Answer 3

There are two prominent, nationally circulated newspapers, The Wall Street Journal and USA Today. Among all libraries across the country, 45% subscribe to The Wall Street Journal and 40% subscribe to USA Today, while only 25% subscribe to both The Wall Street Journal and USA Today. If a library is selected at random, what is the probability that it subscribes to The Wall Street Journal but not USA Today?

10%
15%
20%
25%
60%

Answer 4

@tabicyrus , @odubbs answer is incorrect since the marbles ARE NOT replaced

Answer 5

it will be 7/8 x 6/7 x 5/6
since you are taking out one marble each time

Answer 6

Whoops my bad! Then that's going to be 7/8 * 6/7 * 5/6 which is .625

Answer 7

the answer is .625

Answer 8

aw darn i wish i could give you both medals :(

Answer 9

Thank you !!

Answer 10

i did it

Answer 11

There are two prominent, nationally circulated newspapers, The Wall Street Journal and USA Today. Among all libraries across the country, 45% subscribe to The Wall Street Journal and 40% subscribe to USA Today, while only 25% subscribe to both The Wall Street Journal and USA Today. If a library is selected at random, what is the probability that it subscribes to The Wall Street Journal but not USA Today?

10%
15%
20%
25%
60%

Answer 12

sorry i dont know how to do this one ;(

Answer 13

no worries thank you! :)