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Mean/ standard deviation

  • #1
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1. An airline's flights have a mean arrival time of 5.8 min late with standard deviation of 2.1 min. What would be the appropriate x - scale for a histogram?



2. http://www.mathsrevision.net/gcse/sdeviation2.gif [Broken]



3. I tried to do this problem, but I couldn't think of anyway to find the x - scale. Can you please explain to me how? Thank You!
 
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Answers and Replies

  • #2
CompuChip
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I don't know if this is really what they are asking, but in a normal distribution probability of finding a value outside two standard deviations (on either side) of the mean is about 5%. So usually, if you fit 3 ~ 5 standard deviations on your x-scale you are good.
 
  • #3
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I don't know if this is really what they are asking, but in a normal distribution probability of finding a value outside two standard deviations (on either side) of the mean is about 5%. So usually, if you fit 3 ~ 5 standard deviations on your x-scale you are good.
There asking for what you said, but I don't get what u mean about the 5% and how did u get 3 ~ 5 standard deviations.
 
  • #4
CompuChip
Science Advisor
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