The formula is an illustration of Excel functions and formulas
The formula to enter in cell R8 is =AVERAGEIF(M2:M31,"Elected",D2:D31)
The AVERAGEIF function is used to calculate the average of a range of numbers if a certain condition is true.
From the complete question,
The range is M2 to M31
The condition is to check is the students in range D2 to D31 have been elected
The syntax of the AVERAGEIF function
=AVERAGEIF(range,criteria,average_range)
So, the formula to enter in cell R8 is =AVERAGEIF(M2:M31,"Elected",D2:D31)
Read about Excel formulas at:
https://brainly.com/question/19595618