Question
In: Statistics and Probability
The time to failure (T) in thousands of hours for a sample of 5 electric motors...
The time to failure (T) in thousands of hours for a sample of 5 electric motors was {8, 11, 16, 22, 34}. Assume T has a log-normal distribution, estimate the probability that an electric motor lasts less than 5,000 hrs.
Solutions
orchestra answered 2 years agoRelated Solutions
The failure time T (in hours of use) for a particular electronics component follows an exponential...
The failure time T (in hours of use) for a particular
electronics component follows an exponential distribution with
parameter λ. Find the probability that a failure time is somewhere
within 1 standard deviation of the mean failure time. Explain in
words what you did to solve this, and then tell me your final
answer.
Suppose you have the following aircraft part failure time data (in thousands of hours). Part XRR-012...
Suppose you have the following aircraft part failure time data
(in thousands of hours).
Part XRR-012 failure times:
10.03 11.61 6.13 12.24 42.10 6.66 38.59 22.09 33.34 23.56 17.82
10.47 20.80 16.51 4.86 23.64* 40.50* 45.07* 41.57* 80.48* 12.48*
21.93* 45.03* 10.75* 7.76* 8.18* 38.20* 28.28* 18.55* 24.44* Where
the asterisk (*) indicates the part is still active on an aircraft
(that is, the part is in current use and has not failed yet).
Describe how you would fit a...
Suppose you have the following aircraft part failure time data (in thousands of hours). Part XRR-012...
Suppose you have the following aircraft part failure time data
(in thousands of hours).
Part XRR-012 failure times:
10.0311.61 6.1312.2442.10
6.6638.5922.0933.3423.56
17.8210.4720.8016.51 4.86
23.64*40.50*45.07*41.57*80.48*
12.48*21.93*45.03*10.75* 7.76*
8.18*38.20*28.28*18.55*24.44*
Where the asterisk (*) indicates the part is still active on
an aircraft (that is, the part is in current use and has not failed
yet).
a) Describe how you would fit a gamma distribution to the
first 15 data points (first 3 rows of data).
b) Your manager asks you to fit...
The temperature at time t hours is T(t) = −0.6t2 + 2t + 70 (for 0...
The temperature at time t hours is
T(t) = −0.6t2 + 2t + 70
(for 0 ≤ t ≤ 12). Find the average temperature between
time 0 and time 10.
Bradford Electric Illuminating Company is studying the relationship between kilowatt-hours (thousands) used and the number of...
Bradford Electric Illuminating Company is studying the
relationship between kilowatt-hours (thousands) used and the number
of rooms in a private single-family residence. A random sample of
10 homes yielded the following.
Number of Rooms
Kilowatt-Hours (thousands)
Number of Rooms
Kilowatt-Hours (thousands)
12
9
8
6
9
7
10
8
14
10
10
10
6
5
5
4
10
8
7
7
Determine the 0.95 confidence interval, in thousands of
kilowatt-hours, for the mean of all six-room homes. (Do not
round...
If the time to failure distribution (PDF) is given by f(t) = gt-4 (t > 2)...
If the time to failure distribution (PDF) is given by f(t) =
gt-4 (t > 2) and f(t) = 0 for t ? 2:
a) What is the value of g?
b) What is the mean time to failure?
c) What is the instantaneous failure rate?
How are electric motors rated?
How are electric motors rated?
Ridgecrest Electric manufactures electric motors. It competes and plans to grow by selling high-quality motors at...
Ridgecrest Electric manufactures electric motors. It competes
and plans to grow by selling high-quality motors at a low price and
by delivering them to customers quickly after receiving customers’
orders. There are many other manufacturers who produce similar
motors. Ridgecrest believes that continuously improving its
manufacturing processes and having satisfied employees are critical
to implementing its strategy in 2015.
1. Is Ridgecrest’s 2015 strategy one of product
differentiation or cost leadership? Explain briefly.
2. Indicate a measure you would expect...
This question is being asked from chapter 5 of the book electric motors and control systems...
This question is being asked from chapter 5 of the book electric
motors and control systems 2nd version and the files attached.
file:///C:/Users/prime/Downloads/ET55a%20Single%20Phase%20AC%20Motors%20%236B.pdf
file:///C:/Users/prime/Downloads/ET55a%20Three%20Phase%20AC%20Motors%20%236A.pdf
1. What are the differences (in construction, starting torque,
and operation) between “capacitor start” and “capacitor
start/capacitor run” motors?
This question is being asked from chapter 5 of the book electric motors and control systems...
This question is being asked from chapter 5 of the book electric
motors and control systems 2nd version and the files attached.
file:///C:/Users/prime/Downloads/ET55a%20Single%20Phase%20AC%20Motors%20%236B.pdf
file:///C:/Users/prime/Downloads/ET55a%20Three%20Phase%20AC%20Motors%20%236A.pdf
1. Why does an induction motor (with a squirrel cage rotor) need
“slip” - operating at less than the synchronous speed (the speed in
which the magnetic field rotates in the stator)?
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