yet again, probability

G

Guest

Guest
A bag contains 5 red marbles, 5 white marbles, and 5 blue marbles. A single marble is chosen at random. Let A and B represent the following events:

A:"A red marble is drawn"
B:"A white marble is drawn"

a. Determine P(A and B)

b. Determine P(A or B)
 
Amy-Marie, Think this one through for YOURSELF!

a) Can any marble be red and white at the same time?
If it can’t happen what is the probability?

b) If it is not red or white it must be green, RIGHT?
What is the probability of its being green?
Well if it is not green then it must be red or white!
 
I've already done the work I was checking if I've got the right answer, thank you very much!
 
Amy-Marie said:
I've already done the work I was checking if I've got the right answer, thank you very much!
Click to expand...

Well then, next time tell us that!
Show what answers you have gotten.
 
Greetings!.....finally a probability question I think I know.....well the probability of chooisng A and B means to multiply the probability of choosing A, by the probability of choosing B. Since choosing A is 5/15=1/3, you multiply that by 1/3 again and get 1/9. For " or " cases, you add each probability togeather to find the probaility of either one occuring. Thus, 1/3+1/3=2/6, which equals 1/3.....a much better chance!!!!!! good Luck....Smiles :D
 
yeah...ok sorry about that.....the probability of choosing both a red and white at the same time is 0...you can't have a pink marble....lol......pka was right.....late nights and too much math homework....sorry about that :wink:
 
You must log in or register to reply here.
Top