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anonymous

  • one year ago

How do I calculate the probability of a value being between 60.5 and 70.5 when the standard deviation is 2.5 and the mean is 65.5?

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  1. campbell_st
    • one year ago
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    well 70.5 is 65.5 + 2x 2.5 so 70.5 is 2 standard deviations above the mean 60.5 is 65.5 - 2x2.5 so 60.5 is 2 standard deviations below the mean... attached is an image of the standard Normal curve... 0 is the mean so you want the total of the percentages between -2 and 2 hope it helps

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  2. anonymous
    • one year ago
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    ok, so if I ever have a problem like that, I just need to find how many standard deviations is the mean from the bounds and then add the percentages related to each standard deviation?

  3. anonymous
    • one year ago
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    the sum would be 95%. Wow! I was busting my brain over nothing!

  4. campbell_st
    • one year ago
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    that's correct.

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