HI. I need Your help. Have a great massive of data like this:
A B C Expected result
1 a 4 -average (B1:B4)
2 a 4.1 -average (B1:B4)
3 a 3.5 -average (B1:B4)
4 a 2 -average (B1:B4)
5 b 1.1 -average (B5:B6)
6 b 1.7 -average (B5:B6)
7 c 1 -average (B7:B9)
8 c 5 -average (B7:B9)
9 c 2 -average (B7:B9)
...
Which formula do I need to create that will find the same value from "A" and return the average meaning from "B" whith the same "A" to the column "C"
