SOLUTION: Five identical and unbiased coins are shaken. What is the probability of obtaining 3 heads?

Algebra ->  Probability-and-statistics -> SOLUTION: Five identical and unbiased coins are shaken. What is the probability of obtaining 3 heads?      Log On


   

Question 420709: Five identical and unbiased coins are shaken. What is the probability of obtaining 3 heads?
Found 2 solutions by sudhanshu_kmr, stanbon:
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

probability = 5C3 * (1/2)^3 * (1/2)^2
= 10 * 1/8 * 1/4
= 5/16


Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Five identical and unbiased coins are shaken. What is the probability of obtaining 3 heads?
-------------------------
Binomial Problem with n = 5 and p = 1/2
-----
P(x = 3) = 5C3(1/2)^3*(1/2)^2 = 10/32 = 5/16
------------------------------------------------
Cheers,
Stan H.
==============