Here are the shopping times (in minutes) ?

Question

for a sample of 5 shoppers at a particular clothing store ?

40,25,33,43,39

Find the standard deviation of this sample of shopping times. Round your answer to at least two decimal places.

Answer 1

I don't remember how to show my work on this, but..

mean = 36

standard deviation = √[ ( (4² + (-11)² + (-3)² + 7² + 3²) )/4] = √[ ( (16 + 121 + 9 + 49 + 9) )/4 ] = √(204/4) = √51 = 7.141428

And checking my math with Excel...hey, I still know how to do this.