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anonymous

  • one year ago

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?

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  1. anonymous
    • one year ago
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    @skullpatrol @rational

  2. rational
    • one year ago
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    as a start, look at the ztable and find out the "zscore" corresponding to the area of "0.05"

  3. rational
    • one year ago
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    do you have ztable wid you ?

  4. anonymous
    • one year ago
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    Yeah

  5. rational
    • one year ago
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    look up the zscore corresponding to the area 0.05

  6. anonymous
    • one year ago
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    Okay

  7. rational
    • one year ago
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    let me know the zscore once you find it

  8. anonymous
    • one year ago
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    I have no idea, I cant seem to figure this one out

  9. rational
    • one year ago
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    look at the ztable : |dw:1432810372760:dw| whats the zscore corresponding to the area 0.0495 ?

  10. anonymous
    • one year ago
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    .05

  11. rational
    • one year ago
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    nope, it is actually "-1.65" |dw:1432810549294:dw|

  12. anonymous
    • one year ago
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    -1.6 then

  13. anonymous
    • one year ago
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    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

  14. rational
    • one year ago
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    we're not done yet, use zscore formula next

  15. rational
    • one year ago
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    \[\large -1.65 = \dfrac{x-7}{2}\] solve \(x\)

  16. anonymous
    • one year ago
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    3.7. I feel so stupid now... I dont even know what I was doing wrong. Thank you so much!!

  17. rational
    • one year ago
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    Looks good! yw

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