SPREADSHEETS Monthly rain totals for four counties are listed in the spreadsheet below....

SPREADSHEETS Monthly rain totals for four counties are listed in the spreadsheet below. The –1 entered in cell B1 means that the rain total for Suffolk County for a certain month was 1 inch below average. We can analyze these data by asking the computer to perform various operations.

a. To ask the computer to add the numbers in cells B1, B2, B3, and B4, we type SUM(B1:B4). Find this sum.

b. Find SUM(F1:F4).