Probability

[Cha0s]

What is the probability to fliping 3 head in 15 tries of a fair coin?
and how did you come out with the answer?
Thanks

 

[UncleWai]

Binomial distribution

 

[saltedeggman]

Originally posted by: UncleWai
Binomial distribution

i remember that from stats class 🙂 cool

 

[Cha0s]

would this be correct (1/2) change to get 1 head, to get 3 heads = (1/2)(1/2)(1/2)*15 because there are 15 tries = 15/8 = 1,875 = 187.5% ?

 

[TheChort]

Originally posted by: UncleWai
Binomial distribution

[15!/(3!*12!)]/2^15


EDIT: simplification

(15*14*13)/(3*2^16)

 

[TheChort]

I think this is right:
0.013885498046875

1.39% chance of flipping only 3/15 heads

 

[dym]

Originally posted by: Cha0s
would this be correct (1/2) change to get 1 head, to get 3 heads = (1/2)(1/2)(1/2)*15 because there are 15 tries = 15/8 = 1,875 = 187.5% ?

can't be more wrong!!!

(15*14*13)/(3*2^16) was rite.

 

[walla]

Originally posted by: Cha0s
would this be correct (1/2) change to get 1 head, to get 3 heads = (1/2)(1/2)(1/2)*15 because there are 15 tries = 15/8 = 1,875 = 187.5% ?

Umm...check your calculator 🙂

edit: or did you mean 1.875? anyway, probability can never be greater than one so that should be your first hint in probability problems.