Explanation
Right Click on the Customer Name -> Create -> Set
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Create a calculated field:
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Drop the Top 20 by Sales set, Customer Name to Rows.
Drop Sales and Profit Ratio to the view. Format the profit ratio so it will show the percentage.
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Sort the Profit.
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Refer: https://help.tableau.com/current/pro/desktop/en-us/maps_custom_territories.htm

Explanation
Here we have to use the Obesity View only, so let's go to that sheet:

Click on go to sheet as per above.
Edit the State filter and select only North Carolina:

Duplicate this sheet as Crosstab

3 counties in North Carolina are having an obesity rate that is 8% below the regional obesity rate.
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Note: For dashboard questions, I prefer to follow above approach wherever it is applicable. I find it easy to get the answers.

All are false here.
Refer: https://help.tableau.com/current/pro/desktop/en-us/maps_shapefiles.htm

Add the Country population excel sheet as a New Data Source.
Select column 1960 to 2013, click on Pivot.
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Rename the new fields as Year and population.
Go to Data ->Edit Blend Relationship
Click on Custom and Add
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Ensure the blend relationship exists in Country & Country Name, and year & year between primary and secondary data sources.
Drop the year to the filters shelf and only enter 1963.
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Drop Country and Number of Records / volerup(Count) field to the view.
And drop population to the view from the secondary data source. Your view will look like this:
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