In: Physics
a. Consider two different types of motors. Motor A has
a characteristic life of (4034) hours
and a shape parameter β = 0.9. Motor B has a characteristic life of
(434) hours with a
shape parameter β = 2.8. Which of these offers better reliability
for 100 hours? Which of
these offers better reliability for 500 hours?
b. A different gasket (known to be at constant failure
rate) has a MTBF of 10
months.
1. What is the reliability at (217) days?
2. How many days does it take for the reliability to fall to a 90%
level?
3. How many days does it take for the reliability to fall to a 80%
level?
c. Given that a complex software system
averages (44) errors per 20,000
lines of code, you are looking at managing a 10,000 line program.
What is the
probability of exactly 0, 1, and 2 errors in 10 000 lines of code?
What is the probability
of 2 or more errors? Show calculations below, with answers to two
decimal places.
# of errors Probability
0
1
2
>2
100. 00 %