anonymous
  • anonymous
The average life of a motorcycle is 7 years with a standard deviation of 2 years. If the manufacturer is willing to replace only 5% of the motors that fail, for how many years can the company offer a replacement guarantee?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
@skullpatrol @rational
rational
  • rational
as a start, look at the ztable and find out the "zscore" corresponding to the area of "0.05"
rational
  • rational
do you have ztable wid you ?

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anonymous
  • anonymous
Yeah
rational
  • rational
look up the zscore corresponding to the area 0.05
anonymous
  • anonymous
Okay
rational
  • rational
let me know the zscore once you find it
anonymous
  • anonymous
I have no idea, I cant seem to figure this one out
rational
  • rational
look at the ztable : |dw:1432810372760:dw| whats the zscore corresponding to the area 0.0495 ?
anonymous
  • anonymous
.05
rational
  • rational
nope, it is actually "-1.65" |dw:1432810549294:dw|
anonymous
  • anonymous
-1.6 then
anonymous
  • anonymous
But thats not one of the answers. thats why I dont get it. it says 2.1 years 2.8 years 3.7 years 4.9 years
rational
  • rational
we're not done yet, use zscore formula next
rational
  • rational
\[\large -1.65 = \dfrac{x-7}{2}\] solve \(x\)
anonymous
  • anonymous
3.7. I feel so stupid now... I dont even know what I was doing wrong. Thank you so much!!
rational
  • rational
Looks good! yw

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