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The company wishes to offer a warrantee for a free replacement of any transmissions that fail prematurely, but only wants to replace 1% of the transmissions that they sell. How long should they set the warrantee period?

Jun 3rd, 2015

Please let me know if you need any clarification. I'm always happy to answer your questions.

please let me know are there any missing part of the question?is this all information given?

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 3rd, 2015

I don't know exactly how to answer this problem or solve this problem?

Jun 3rd, 2015

are there any missing part of the question?is this all information given?

Jun 3rd, 2015

No this is all the information that is given. :D

Jun 3rd, 2015

ok..please wait for while 

Jun 3rd, 2015

we know the percentage of replacement=1%

to solve for time period we need the additional data how many products made for a exact period of time

but it's not given in the question

so lets assume 100 products made for warranty period

0.1=x/100

x=10

so warranty period is 10 months


but we assumed warranty period is given in months...


Jun 3rd, 2015

I have just reread the question, with one above. There is more information... 


It has been determined that the lifetime of transmission is normally distributed with an average of 78,000 miles and a standard deviation of 15000 miles

Jun 3rd, 2015

ok i'll check then 

Jun 3rd, 2015

z=x-mean/stranded deviation

z=x-78000/15000

but we need more additional data.can you send me hole question?

Jun 3rd, 2015

This is the whole question. It has been determined that the lifetime (time until failure) of this transition is normally distributed with an average of 78,000 miles and a standard deviation of 15,000 miles. 

First question: What percentage of these transmissions will last at least 90,000 miles? answer= 21%

So the second question..

So the company wishes to offer a warrantee for a free replacement of any transmissions that fail prematurely, but only wants to replace 1% of the transmissions that they sell. How long should they set the warrantee period?

Jun 3rd, 2015

please see attach

s 

z value 

Jun 3rd, 2015

WOW!!! :D Thank you so much!!!!!!!

Jun 3rd, 2015

you are always welcome..please don't forget to rate me 

Jun 3rd, 2015

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Jun 3rd, 2015
Aug 19th, 2017
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