Asked by emily
The following table gives the percentage of on-time arrivals in U.S airports from 2004 through 2013.
Year 2004 2005 2006 2007 2008
On time arrivals/% 76.13 74.35 77.11 70.33 70.55
Year 2009 2010 2011 2012 2013
On time arrivals/% 79.69 76.75 75.46 84.93 80.33
Average - 765.63/10 = 76.563% but how do I set up the formula to find the standard deviation?
Year 2004 2005 2006 2007 2008
On time arrivals/% 76.13 74.35 77.11 70.33 70.55
Year 2009 2010 2011 2012 2013
On time arrivals/% 79.69 76.75 75.46 84.93 80.33
Average - 765.63/10 = 76.563% but how do I set up the formula to find the standard deviation?
Answers
Answered by
PsyDAG
From Google:
To calculate the standard deviation of those numbers:
Work out the Mean (the simple average of the numbers)
Then for each number: subtract the Mean and square the result.
Then work out the mean of those squared differences.
Take the square root of that and we are done!
To calculate the standard deviation of those numbers:
Work out the Mean (the simple average of the numbers)
Then for each number: subtract the Mean and square the result.
Then work out the mean of those squared differences.
Take the square root of that and we are done!
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