Question

A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a blue marble, replacing it, and then picking another blue marble?


I have dyscalculia which is a learning disability in math where i have trouble manipulating numbers. So if someone could please explain this clearly i would appreciate it, i struggle a lot with fractions.

Answer 1

Ok well I'll go as slow as you need me to

Answer 2

First what we have to do it add up all the marbles.

5 red+ 6 blue+ 4 black=15 marbles in all. Do you get that?

Answer 3

yes

Answer 4

I understand the blue part turns into 2/5 correct?

Answer 5

Correct. And if they want to pick out a blue one, then the probability is 2/5. If you put it back then the probability is "restored", which means the probability is still 2/5.

If you were to keep the blue marble, then there would be 5 marbles left and he probability would change to 5/15.

Anyways, the question says they put the marble back and now the probability of picking a blue marble is again 2/5 so you just have to multiply (2/5) for the first time you pick a blue out by (2/5) again since you put it back after the first pickup

Answer 6

you get 4/25 since you do 2 times 2 over 5 over 5

Answer 7

OMG THANK YOU!!

Answer 8

Yw