Qr Question

[goat1360]

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A fair coin is tossed 6 times what is the probablity that exactly 2 heads will show?
a)15/64
b)5/16
c)1/3
d)3/8
e)15/32

Please show me the solution?

 

[Streetwolf]

A fair coin is tossed 6 times what is the probablity that exactly 2 heads will show?
a)15/64
b)5/16
c)1/3
d)3/8
e)15/32

Please show me the solution?

Select the 2 heads with a combination: (6 C 2) = 15.
Probability that 2 coins flip heads: (1/2)^2 = 1/4.
Probability that 4 coins flip tails: (1/2)^4 = 1/16.

Solution = 15/64 (A).

Don't know what a combination is? Or the difference between combination and permutation? Google it or search the forums. Been answered here a LOT.