*PLEASE DON'T simply write the answer, I NEED STEP BY STEP, on how to do it
This is a Probability distribution question i don't understand how to answer is, there are 3 questions
In order to verify the accuracy of their financial accounts, companies use auditors on a regular basis to check the accuracy of the accounts entries. The companies accountants make errors in 5% of the entries. If an auditor randomly checks 3 entries, and the random variable Y is the number of errors detected by the auditor, then
a) Find the probability distribution of the random variable Y,
b) Find E(Y) and Var(Y),
c) And the probability that more than one error will be found by the auditor?
c) Pr(Y > 1) = Pr(Y = 2) + Pr(Y = 3).
Alternatively, Pr(Y > 1) = 1 - Pr(Y = 0) - Pr(Y = 1).