mean and the standard deviation

The following dtables provide information about the top women-owned businesses in 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 gibes the same information for Michigan women-owned companies with year 2000 revenues of $70 million or higher.

Pennsylvania compa 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
Wetherill associates 135 500
Hanna holdings 73.7 1284

Michigan companies 2000 revenue ($million) number of employees

Ilitch holdings 800 700
Plastech engineer 420 3500
Jerome-duncan ford 350 300
Elder ford 287.6 108
Patsy Lou 221 240
Mexican ind 174 1463
Rush trucking 153 2000
jaguar-saab 143 134
manpower metro 118 250
continental plastic 107 650
leco 82 800
rodgers chevrolet 75 80
strategic staffing 75 600
two men & a truck 75 40
systrand manu 72 230

question a. 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.

question b. use a calculation or computer to compute the mean and standard deviation of the year 2000 revenue for the Michigan companies in the second table.

question c. explain what the values you calculatwd in parts a and b of this exploration tell you about the data sets.

question d. how would the mean and standard deviation change if the largest data value in each set were removed?

question e. find the mean and the standard deviation of the number of employees for the Pennsylvania companies in the first table.

question f. 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 the exploration.