# Thread: Probability of Coins toss....

1. ## Probability of Coins toss....

Can anybody please help me solve the following using simple method or using formulae....

4 coins are tossed....Probability of getting 4 tails, atleast 2 tails, atmost 3 heads and exactly 2 heads. Please help.

2. Originally Posted by yekkalu
Can anybody please help me solve the following using simple method or using formulae....

4 coins are tossed....Probability of getting 4 tails, atleast 2 tails, atmost 3 heads and exactly 2 heads. Please help.
Have you tried drawing a tree diagram?

Alternatively (and more tediously), have you listed all 16 possible outcomes (not that each is equally likely) .....?

Alternatively, are you familiar with the Binomial distribution?

3. Mr.Fantastic.....can you pls tell me how to solve the above problems using formulae......rather than anything which is complicated.....that would be helpful....I've seen this questions and started working on it.....instead I thought I'll find out from the experts if there are any formulae for such kind of problems.........I've started learning maths recently.......pls help.

4. Originally Posted by yekkalu
Mr.Fantastic.....can you pls tell me how to solve the above problems using formulae......rather than anything which is complicated.....that would be helpful....I've seen this questions and started working on it.....instead I thought I'll find out from the experts if there are any formulae for such kind of problems.........I've started learning maths recently.......pls help.
Binomial distribution. Google it. Read it. Learn it. Use it.

5. Can anyone pls suggest.

6. Originally Posted by yekkalu
Can anyone pls suggest.
You have been given three suggestions. Using the binomial distribution is the closest to a formula that you get. Yuo replied within 10 minutes of my last post. I don't see how that could be nearly enough time to try and do as I suggested. Read this: http://72.14.235.132/search?q=cache:...&ct=clnk&gl=au

Or this:

Statistics Tutorial: Binomial Distribution or this 1.3.6.6.18. Binomial Distribution or this Binomial Distribution (1 of 3) etc.