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Weighted Quartile With Frequency

Hi guys,

I have some data like this:

Disease code cost # of patients
101 6 20
102 5 20
103 4 12
101 7 45
101 3 20

I understand that I could use array formula =QUARTILE(IF(A1:A6=E1,B1:B6),1) to calculate the 1st quartile on the cost alone. However, this does not make sense since there are 20 people receiving $6 for 101 in the first entry. The complete data should be 6,6,6,6,.....6 (20 times).

Is there a way to incoporate that into the Quartile formula without actually writing it 20 times?

Any help is appreciated!

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