how to solve this problem

Question

HOW TO SOLVE THIS PROBLEM!

Consider a binomial experiment with n = 4 trials

 where the probability of success on a single trial is p = 0.45.

 (Round your answers to three decimal places.)

(a) Find P(r = 0).

(b) Find P(r ≥ 1)

 by using the complement rule.

Answer 1

Well if r=0 that means you get 4 failures so P (r=0) = (1 - 0.45) ^4

P (r=0) + P (r>=1) = 1 so P (r>=1) = 1 - (1 - 0.45)^4