The probability that an appliance is currently being repaired is .5. If an apartment complex has 100 such appliances, what is the probability that at least 60 are currently being repaired? Use the normal approximation to the binomial.
A) .5000
B) .0287
C) .6000
D) .9713

Question

Quizplus · Accepted Answer

z = (59.5 − (.5)(100)/√[(.5)(.5)(100)] = 1.9
P(z ≥ 1.9) = 1 − .9713 = .0287

The Probability That an Appliance Is Currently Being Repaired Is