Let N have a Binom100 14 distribution Given N n flip a fair
     Let N have a Binom(100, 1/4) distribution. Given N = n, flip a fair coin n times, and let X be the number of heads observed.  What is the distribution of X given N = n. Be sure to provide a range and a proper conditional probability mass function.  Find the random variable E(X|N).  Using part (b), compute E(X). (If you do not use part (b), and instead just give an educated guess, you will receive zero points.) 
  
  Solution

