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anonymous

  • one year ago

what is the area under the normal bell curve between z-scores of 1.82 and 2.09

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  1. johnweldon1993
    • one year ago
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    Need to find a table quick hang on a sec lol

  2. anonymous
    • one year ago
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    oke. c:

  3. shelby33
    • one year ago
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    The standard normal distribution is a normal distribution with a standard deviation on 1 and a mean of 0.

  4. anonymous
    • one year ago
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    the choices i have are A:1.96% B:1.61% C:0.82% D:2.23%

  5. anonymous
    • one year ago
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    so c?

  6. anonymous
    • one year ago
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    could it be A, because its between 1.82 &2.09?

  7. johnweldon1993
    • one year ago
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    Okay got one lol So first we have a normal bell curve |dw:1433865528044:dw| *Kinda butchered it but oh well lol So we have a z-score of 1.82 and 2.09 From this table...the value for the area given will be from -infinity to the z-score...so Area from -infinity to 2.09 = 0.9817 Area from -infinity to 1.82 = 0.9656 So what we need to do is subtract these 2 numbers \[\large 0.9817 - 0.9656 = 0.0161\] Since you have percents as your answer choices...that will be 1.61%

  8. johnweldon1993
    • one year ago
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    The reasoning behind this is... We find the area under the curve up to 2.09 |dw:1433865849226:dw| And then we find the area under the curve up to 1.82 |dw:1433865898143:dw|

  9. anonymous
    • one year ago
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    ah..yeah now i remember something about that from when i took the actual class. *facepalm* thanks so much!

  10. johnweldon1993
    • one year ago
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    Now of course be want the area BETWEEN the 2 scores...so as we can see...we have some overlap.... |dw:1433865949260:dw| so we merely subtract :D

  11. johnweldon1993
    • one year ago
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    And lol no problem :D

  12. shelby33
    • one year ago
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    yes

  13. shelby33
    • one year ago
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    johnweldon1993 plez message I need to ask u some thing

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