Probability

[rebecca515]

A bag contains 6 red balls and 4 blue balls.

3 balls are selected at random.

Find the probability of selecting 3red balls.

The probability is_____

I have 11 of these problems and i dont know how to do them, so can someone solve this step by step for me so i can do the rest of them and will understand?
Thank you so much!

 

[Deleted member 4993]

A bag contains 6 red balls and 4 blue balls.

3 balls are selected at random.

Find the probability of selecting 3red balls.

The probability is_____

I have 11 of these problems and i dont know how to do them, so can someone solve this step by step for me so i can do the rest of them and will understand?
Thank you so much!

Let's do a simpler problem first. Suppose you were to pick 1 ball.

What is the probability of picking 1 red ball from the given mixture of 10 balls?

Please show us what you have tried and exactly where you are stuck.​

​

Please follow the rules of posting in this forum, as enunciated at:​

​

https://www.freemathhelp.com/forum/threads/read-before-posting.109846/#post-486520​

​

Please share your work/thoughts about this assignment.​

 

[rebecca515]

Let's do a simpler problem first. Suppose you were to pick 1 ball.

What is the probability of picking 1 red ball from the given mixture of 10 balls?

Please show us what you have tried and exactly where you are stuck.​

​

Please follow the rules of posting in this forum, as enunciated at:​

​

https://www.freemathhelp.com/forum/threads/read-before-posting.109846/#post-486520​

​

Please share your work/thoughts about this assignment.​

I don't know how to do any of it or even where to start. I don't have any work to show me how. I apologize.

 

[pka]

I don't know how to do any of it or even where to start. I don't have any work to show me how. I apologize.

Please do tell us what course you find yourself in. Describe the course.
That is the name of your textbook and what is the author(s) name(s).
Looking at the question that you first posted, tell us what you think is going on there.
Here is a small bit of help now: Look into your textbook. Does it tell you anything about counting collect of things?
If you are given a group of ten people then can you find how many possible subgroups of three people from that group are possible?
Please post a reply!

 

[Dr.Peterson]

I don't know how to do any of it or even where to start. I don't have any work to show me how. I apologize.

In order to try to help you, we need some idea of where to start! That is the purpose of pka's questions.

Please tell us what you have learned that is relevant. Do you know about combinations? How about probability? If you are taking a course, is it about probability, or is that just a small part? What has it covered so far?

What method we suggest depends very much on what you already know.

 

[Steven G]

There are 6 red balls and 4 blue balls.

That is, there are ten balls all together of which 6 are red.
Suppose we numbered the 10 balls 1-10. Since each ball is equally likely to be picked if you picked 1 ball, put it back then picked another ball and put it back,... for 10 times you would expect to have picked each ball once. This probably won't happen each time you pick 10 balls but we expect that to happen. So in 10 picks we expect to get 6 red balls and 4 blue balls (actually we expect to get all 6 different red balls and all 4 different blue balls. So in ten trials we expect to get 6 red out of 10 or 6/10. That 6/10 is the answer to what is the probability you pick one ball and it is red.