Mean and Standard Deviation

The following tables provide information about the top women-owned businessesin the U.S. The first table gives year 2000 revenue in millions of dollars
and number of employees for Pennsylvania women-owned companies with year 2000 revenues of $70 million or higher. The second table gives the same
information for Michigan women-owned companies with year 2000 revenues
of $70 million or higher.

Pennsylvania Companies 2000 Revenue ($ million) Number of Employees
84 Lumber 2000 4400
Charming Shoppes 1600 12000
Rodale 500 1300
Mothers Work 366.3 3800
Harmelin Media 200 105
McGettigan Partners 175 400
Wetherill Associates 135 500
Hanna Holdings 73.7 1284
Michigan Companies 2000 Revenue ($ million) Number of Employees
Ilitch Holdings 800 700
Plastech Engineered Products 420 3500
Jerome-Duncan Ford 350 300
Elder Ford 287.6 108
Patsy Lou Williamson Auto. Gp. 221 240
Mexican Industries 174 1463
Rush Trucking 153 2000
Jaguar-Saab of Troy 143 134
Manpower Metro Detroit 118 250
Continental Plastics 107 650
Leco 82 800
Rodgers Chevrolet GEO 75 80
SSTc17

Michigan Companies 2000 Revenue ($ million) Number of Employees
Strategic Staffing Solutions 75 600
Two Men & a Truck Internat'l 75 40
Systrand Manufacturing 72 230
Use a calculator or computer to compute the mean and standard deviation
of the year 2000 revenue for the Pennsylvania companies in the first table.
Use a calculator or computer to compute the mean and standard deviation
of the year 2000 revenue for the Michigan companies in the second table.
Explain what the values you calculated in parts a and b of this exploration
tell you about the data sets.
How would the mean and standard deviations change if the largest data
value in each set were removed?
Find the mean and the standard deviation of the number of employees for
the Pennsylvania companies in the first table.
Find the mean and the standard deviation of the number of employees for
the Michigan companies in the second table and compare to your results
in part e of this exploratio