A company should decide between two AC motors. Motor A has .000011 failures per hour. Motor B follows normal distribution with mean time to failure = 13,250hr and standard deviation = 3310 hr.
i) Based upon the mean times to failure, which motor is better?
ii) Which motor has less probability to fail before 2 years?
iii) If motor A was selected, what is the probability that motor will fail during the first 5 years?