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Thread: Statistic question?

  1. #1
    Junior Member Gigsaw is on a distinguished road Gigsaw's Avatar
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    Default Statistic question?

    Mrs. Smith's reading class can read an average of 175 words per minute with a standard deviation of 20 words per minute. The top 3% of the class is to receive a special award. What is the minimum number of words per minute a student would need to read in order to get the award? Assume the data is normally distributed.

  2. #2
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    Default Re: Statistic question?

    Gonna go with 213.

  3. #3
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    Default Re: Statistic question?

    Lol new members posting non-mecha- and non-anime-related threads in mecha.

    Moved to misc.
     

  4. #4
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    Default Re: Statistic question?

    This is a Z-score question. Read a really bad explanation of it here: http://en.wikipedia.org/wiki/Standard_normal_table or do something many students don't do (open your textbook)

    If you look at the table, if you want to be in the top 3%, that means your Z-score must be equal to or greater than 97% of all the results. Apparently, this means a z-score of about 1.88. Now you just use the formula on the same page to convert from z-score back to normal, and you get: (Z*σ)+μ = (1.88*20 WPM)+(175 WPM) = 212.6 WPM

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  5. #5
    Corrupted Data Inc. CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon has a reputation beyond repute CrimsonMoon's Avatar
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    Default Re: Statistic question?

    Gahh, maths + statistics hate me. ._.

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    Default Re: Statistic question?

    I think if the students do their own goddamn homework, they're sure to get that award.



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  7. #7
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    Default Re: Statistic question?

    Don't forget to show your work.


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    Default Re: Statistic question?

    Quote Originally Posted by Eris View Post
    I think if the students do their own goddamn homework, they're sure to get that award.
    There's that, but this question is oddly common on the net. I've seen it at least twice before on other forums.

  9. #9
    Senior Member Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak has a reputation beyond repute Explorer Oak's Avatar
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    Default Re: Statistic question?

    ... -.-" So your looking for a number? Hmm, how about 2.141592..

  10. #10
    Devourer of Realms Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman has a reputation beyond repute Munchman's Avatar
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    Default Re: Statistic question?

    Since there's already a topic for this kinda stuff , answer this:

    A teacher is going to put this exact question on a test:
    What is the chance of getting this question right ,assuming you guess it?
    A)33% B)50% C)25% D)25%

    Do your best...
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  11. #11
    Senior Member Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope has a reputation beyond repute Cantelope's Avatar
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    Default Re: Statistic question?

    What the hell, this is like Yahoo! Answers; I do someone's god damn homework and they don't even have the courtesy to give me any credit for it. RUINED MAH DAY



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