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=SUMPRODUCT((1/COUNTIF('A&E Reattendances Same'!N2:N94,'A&E Reattendances Same'!N2:N94))*('A&E Reattendances Same'!F2:F94='Weekly Activity Summary'!K4))
SUMPRODUCT((1/COUNTIF(N2:"N" & COUNTA(B:B),N2:"N" & COUNTA(B:B)))*(F2:"F" & COUNTA(B:B)="29/05/2016"))