anonymous
  • anonymous
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?
Statistics
katieb
  • katieb
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campbell_st
  • campbell_st
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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anonymous
  • anonymous
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?
anonymous
  • anonymous
the sum would be 95%. Wow! I was busting my brain over nothing!

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campbell_st
  • campbell_st
that's correct.

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