This should help you with number 15 on the homework.

1. Help with Number 15 on the
Week 3 Homework

2. Week 3 Help
• This is the “Show Me An Example” for Number
15 on the homework.
• I simply copied the data to Excel to show you
how easy this is
• You can just as easily use a calculator.

3. Week 3 Help
Copied the data, using the little icon in the corner. I generally
Select, “Make tab delimited copy.”

4. I pasted the data into
Excel (Columns A & B) Week 3 Help

5. Week 3 Help
In column C, I multiplied
column A by Column B then
summed them up to get the
Mean

6. Week 3 Help
In column D, I subtracted
the mean from x (column A)
and squared it

7. In column E, I multiplied
Week 3 Help Column D by P(x) (Column
B)

8. Week 3 Help
Summing Column E gives you the variance. Taking the
square root gives you the standard deviation. You just need
to round correctly.

9. Week 3 Help
• This problem could have been done by hand
or in a spreadsheet, Minitab doesn’t really
have an easy way to do it.
• The answers were absolutely correct.