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Help 19

 Dec 23, 2018
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The mean is 21.75

Std deviation is 7.33

 

One std deviation from the mean is between   14.42   and  29.08

14 values fall within this...so  14/20 =  70%

 

Two std deviation lie between  7.09 and 14.42  and from 29.08 and 36.41

5 values fall here  = 5/20  = 1/4  = 25%

 

1 value falls 3 sd deviations from the mean  = 1/20  = 5%  of data

 

This data is close to  being normally distributed

 

70% falls within 1 std deviationn......68% is expected

 

95% falls wihin 2 std deviations......exactly what we expect

 

And 100% fall within 3 std deviations.....99% is expected

 

 

cool cool cool

 Dec 23, 2018

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