Hi all,I am trying to extract the mean/average of a set of dates through roll-ups. I am able to calculate the min or max date through the use of MIN(values) or MAX(values), but AVERAGE(values) returns NaN.Any suggestions? (thanks in advance!) 

Hi all, does anyone have a formula to calculate Stamp Duty Land Tax (UK) in Airtable? I attach the Excel formula that I previously used. =SUMPRODUCT(--(A1>{125000;250000;925000;1500000}), (A1-{125000;250000;925000;1500000}), {0.02;0.03;0.05;0.02})+(A...