Hi,

An unfair coin comes up heads 52.7% of the time. The coin is flipped a total of 19 times.

 A) what is the probability you get exactly 12 heads? 

(19C12)(.527)^12(.473)7= .1335 (not sure if correct)  

B) What is the probability that you get exactly 11 tails?

 (19C11)(.473)^11(.527)^8= .1338 (again not sure)  

C) What is the probability that you get at most 16 tails?

   P = 1 -P(17T) - P(18T) - P(19T) =  .9998

using stattrek.com  Bionomial Calculator as a reference 

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