I'm having an difficult time, determining how to to start in setting up the problem.
Use the binomial probability to show x successess given to the probability of p of success in an single trial.
n = 5, x = 2 , p = 0.25
Hi
Binomial law is used when you repeat n independent experiences whose result can only be "success" with a probability p or "failure" with a probability (1-p)
The probability to get k success in n trials is given by the formula
$\displaystyle P(X=k) = \binom{n}{k} p^k (1-p)^{n-k}$