Average report + HealthCare module

dears

i made a custom report using the report builder

which resemble patients and their related drugs

as we see

4 Consultation
10 druge

Now i need get a kind of calculation report which will give me
an average

so average = 10/4=2,5

how can we achieve this idea ?

Best regards

an

"
Now i need get a kind of calculation report which will give me
an average
"

How about this? How to Show Total, avg etc at bottom of Column in script report?