Kathleen conducted an experiment in which she drew marbles from a bag one at a time and replaced the marble after each draw. The results of her experiment are shown in the table.

Marble Experiment
Marble Color Number of Times
dawn
Red 8
Blue 2
Green 6
Purple 4
Yellow 10According to the results from Kathleen's experiment, what is the probability that she would draw a green marble and then draw a purple marble, if the first marble is replaced before dawnin

Question

Kathleen conducted an experiment in which she drew marbles from a bag one at a time and replaced the marble after each draw. The results of her experiment are shown in the table.


Marble Experiment
Marble Color        Number of Times
                       dawn
Red                      8 
Blue                     2 
Green                    6 
Purple                   4 
Yellow                   10According to the results from Kathleen's experiment, what is the probability that she would draw a green marble and then draw a purple marble, if the first marble is replaced before dawnin

anonymous · Answer

A. 1/90

B. 2/75

C. 3/145

D. 4/145

anonymous · Answer

help!!

anonymous · Answer

You want to find the probability of each pull and then multiply them together. Do you know how to find the probability?

anonymous · Answer

nope my i can't find how to do it section in my book

anonymous · Answer

Probability is quite simple actually. It's a fraction. 
The total number of possible choices that fit your description over
The total number of possibly choices.

So if you had 3 blue balls and 2 red balls, and wanted the probability of picking a ball it would be 5/5 or 1. Because (duh) you'll always pick a ball. 
To pick a blue ball it would be 3/5 because 3 out of 5 of them are blue. If you put the ball back and drew again there would be the same probability, because nothing has changed. 
If you keep the ball it becomes 2 (started with 3 minus the 1 you're holding) / 4 (started with 5 minus the 1 you're holding.

anonymous · Answer

still a little confused.. do i muitply 5/5 and 3/5?? or 2/4??

anonymous · Answer

My examples had nothing to do with your problem. I was using a hypothetical to try to help you understand how to do it. You have to look at your problem and find the correct numbers.

anonymous · Answer

still don't know how to find the answer??

anonymous · Answer

Your question asks " what is the probability that she would draw a green marble and then draw a purple marble, if the first marble is replaced before drawing"

So, using what I said about how you find probability what would it be? 
Just ask yourself: 
How many green marbles are possible? 
Out of how many total marbles?
How many purples marbles are possible?
Out of how many marbles are there now? 

Use that to form the two fractions and multiply.

anonymous · Answer

can you just tell me the answer and how you got it so i can do the rest of the test??

anonymous · Answer

I did tell you how to get the answer. A few times. And I'm not going to give you the answer, you're supposed to do that on your own. I just told you what the two fractions are, all you had to do was plug in the numbers and use a calculator to multiply.