The syntax is... sum(start:end) - where 'start' is the first cell in the range and 'end' is the last.
Sum Function
To be technically accurate, no function does this. The answer you are looking for is the AVERAGE function. It divides by the amount of cells that have values in them, not by the amount of cells. In most situations, all of the selected cells have values in them, but there are cases when they don't.
In Excel you can use the COUNT function to count the amount of cells that have numbers in them and the COUNTA function to count cells that have any kind of data in them.
It sounds like you are asking about the SUMIF function. SUMIF adds all numbers in a range of cells, based on a given criteria.=SUMIF(range,criteria,sum_range)range = range of cells that you want to apply the criteria against.criteria = determines which cells to add.sum_range = range of cells to sum.
SUM function
The COUNTIF function can do that.
No, the range automatically selected by Excel isn't always right. Excel doesn't know what the user wants to select, but chooses what might be appropriate, like the column of numbers above a SUM function. The user can go with what Excel has chosen, or choose their own cells.
It is a function that allows you to count the amount of blank cells in a range. So if you want to count how many cells were in the range from A2 to A20, the function would be as follows: =COUNTBLANK(A2:A20)
The most basic function in Excel is SUM() Other functions are AVERAGE, MIN, MAX
It you select the blank cell under a column of numbers or a blank cell at the end of a row of numbers and hit the Autosum button it will enter the SUM function and select the cells above in the column, or to the left in a row. Pressing Alt and the = key will also do the same thing. If you select the column or the row with the numbers and click the button or do Alt and the = key, then it will also do the same.
The COUNTIF function in Excel counts the number of cells that meet a specific criterion within a range. You specify the range and the criteria, and it returns the count of cells that meet that condition.
The MODE function finds the most commonly occurring number in a range of numbers.