i don t know how to use excel but i have the answer but i need someone to do it at excel

Hospital records show that of patients suffering from a certain disease , 25% die of it. What is the probability that of 20 randomly selected patients,

  1. Find the probability function for each value of the random variable .
  2. Find the probability that exactly 8 will die .
  3. Find the probability at most 8 will die .