Question

Trying to figure out the problem with my daughter probability. a bag contains 3 red marbles and 7 blue marbles. a marble is drawn and replaced. use an equation to show the probability of drawing 3 red marbles

Answer 1

You want the probability of drawing 3 times, replacing them each time, and getting a red on each draw?
3/10 * 3/10 * 3/10 = 27/1000 or 0.027

Answer 2

I won't take that bet.

Answer 3

Yup that is the correct response

Answer 4

In case you were wondering, if you kept the red ones out:
3/10 * 2/9 * 1/8 = 0.0004

Answer 5

Love probability questions. Got anymore for us?

Answer 6

Basically the probability of picking a red marble is
\[\frac{\text{red marbles}}{\text{ total amount of marbles }}=\frac{3}{10}\]
Now since we keep replacing the marble once picked back into the bag the probability of picking a red marble is always 3/10 for each drawing
Hence we get (3/10)*(3/10)*(3/10)

Answer 7

@jnyberg-homework Do you follow?

Answer 8

Sorry it wasn't working on my phone she has to have an equation...the title of the lesson heading its calculating frequency distribution in saxon math

Answer 9

well the equation is (3/10)*(3/10)*(3/10)=27/1000

Answer 10

I think variables have to be involved

Answer 11

I don't think you are giving us the complete question. To write an equation, something must be unknown or vary.

Answer 12

Yaa im pretty stuck myself. I dont see anything varying

Answer 13

Is the number of draws to get 3 reds unknown?

Answer 14

it is 3 red marbles in a row...notice that was missing

Answer 15

Hmmm any examples in the book to demonstrate what you are referring to

Answer 16

I wish there were this particular book is not the best. Up until this book they were great...

Answer 17

I think they mean that they dont want you to just give an answer they want you to show how you reached your answer. What equation did you use and so the equation you used was (3/10)*(3/10)*(3/10)

Answer 18

glad it wasn't we both went huh

Answer 19

@BangkokGarrett This seems like a very basic probability class in HS. I think its pretty straight forward and should NOT include variables

Answer 20

8th grade algebra 1

Answer 21

She had probability early int he year & this is experimental probability

Answer 22

dunno to me this seems extremely basic and would not include any variables
Showing an equation does not mean it must include variables. It means show the set up of your equation and how you arrived at the solution.

Answer 23

I think I will have her put that & we will see tomorrow what they were after...
I do have one other question she is asking for help on, do I start a new question?

Answer 24

You can ask it here and if I can be of assistance I will help :)

Answer 25

a square has area 9m^4-54m^3+81m^2 square inches what is its side length?

Answer 26

GCF= Greatest Common Factor

Answer 27

Fine
First factor out the GCF from all 3 terms...which is 9m^2
9m^4-54m^3+81m^2
9m^2 * (m^2 - 6m + 9)
9m^2 * (m - 3)^2
(3m)^2 * (m - 3)^2
That's = [3m(m - 3)]^2
So each side of the square is 3m(m - 3) or 3m^2 - 9m

Answer 28

@jnyberg-homework Do you follow the solution?

Answer 29

Sorry we had a quick issue, looking at it now

Answer 30

Which of the answers do you think would be better?

Answer 31

What do you mean? He only provided one answer

Answer 32

the square version or the 3m(m-3) is what my daughter meant