Question

A DELL computer hardware has a yearly 17% rate of failure. Answer the following question. Round the answer up to six decimals; leave them in decimal form.

What is the probability that, if you buy four (4) computers, at least one (1) computer will not fail?!

Answer 1

Here is a picture of the question.

Answer 2

Let X be num of computers that will not fail.

P(X >= 1) = 1 - P(X = 0)

P(X=0) is probability that ALL 4 computers fail

P(X>=1) = 1 - (.17)^4 = 0.99916 = 99.916%