How Can I Fix - average the 6 most recent dates?

average the 6 most recent dates

Column A has a list on various date entries, and column b has a list on numerical entries that correspond to the dates in column A.
I want to use a formula to average the most recent 6 entries (according to the date) in cell C1 and another formula to add
the most recent 6 entries (according to the date) in cell D1.
Is this possible? Thanks.

Anwsers to the Problem average the 6 most recent dates

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...
what if I wanted to average the 30 most recent entries from column B by date with the same scenario already mentioned and also add the 30 most recent entries from column B by date ...

You can hard code the 30 into the formula as you mentioned or put it into a cell and reference the cell.
Let's assume that you put
30 into Z1.
Your two formulas would be,

=AVERAGEIF(A:A,">="&LARGE(A:A,MIN(Z1,COUNT(A:A))),B:B)
...
and,
=SUMIF(A:A,">="&LARGE(A:A,MIN(Z1,COUNT(A:A))),B:B) 

You may want to tighten up those full column references (e.g.
A:A, B:B to
A2:A999, B2:B999) to save some processing power.
You can reference cells that are blank or contain text and they will be happily
skipped over byt the SUMIF() and AVERAGEIF() functions.
I've added a MIN(COUNT()) function to make sure that you are not asking for more values than are available.


AVERAGEIF function

SUMIF function

LARGE function

MIN function

COUNT function

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