How to calculate the average by a unique identifier on Excel 2013

Question

Assuming i have a data with multiple repetition of unique identifiers, how do i calculate the average by these unique identifiers. The actual data has 10,000 rows so it is difficult to do a filter and sort to calculate the average. it becomes very exhaustive and manual for me.

Answer 1

Consider the following very simple example:

The identifiers are in column A and the values to be averaged are in column B . The formula in E1 is:

=AVERAGEIFS($B$1:$B$9,$A$1:$A$9,D1)

Answer 2

Basing on Gary Student 's layout, If I understand you correctly, you want something like this:

For all the Chairs,
Total Quantity: 28+13+5 = 46
Total Price: (28*12) + (13*14) + (5*22) = 628
Weighted Average Price: 628/46 = 13.65217391

I have the following formulas

G2 : =SUMIF($A$2:$A$9,$F2,$B$2:$B$9)

H2 : =AVERAGEIF($A$2:$A$9,$F2,$C$2:$C$9)

I2 : =SUMPRODUCT(($B$2:$B$9*$C$2:$C$9)*($A$2:$A$9=$F2))/SUMIF($A$2:$A$9,$F2,$B$2:$B$9)