Answer:
b. right parenthesis
Step-by-step explanation:
A Microsoft Excel function is used to calculate a given entity. The function is made up of several parts. First is the equal to sign " = " and then the function name. There are different types of functions from different categories. Example of these functions are, Mean, Median, PMT, Average, rank etc.
After the function name is the parenthesis containing the arguments. a function can have two or more arguments.
The Average function is used to calculate the average of a series of numbers. So when an average function is written, if the enter key is pressed before the right parenthesis, excel automatically fills it in and calculate the average. This is the default for all function entry in excel.