Challenge Question #$2$:

a$)$ Rewrite the following statement so that the likelihood of rain is expressed as a value between $0$ and $1$:

"The probability of rain today is $25\%"$

b$)$ "Who discovered penicillin: Marcel Bich, William Penn, Jonas Salk, Alexander Fleming, or Lous Pasteur?" If you make a random guess for the answer to that question, what is the probability that our answer is the correct answer of Alexander Fleming?