116. Find the sample standard deviation for each set of measurements in Exercises 1–16 of Exercises 15.8.
The number of passengers and their luggage weight in pounds on Flight 2102 have been tabulated in the following frequency distribution. Find the mean luggage weight.
Weight(lb)  Midpoint

Frequency

Product

0.59.5  1  
9.518.5  3  
18.527.5  22  
27.536.5  37  
36.545.5  56  
45.554.5  19  
54.563.5  17  
63.572.5  10  
72.581.5  5  
81.590.5  2 
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