I need some help calculating the weighted average of a turnaround time from
month to month based on the number of transactions for each transaction type

Any help with this would be greatly appreciated.


Here is the general layout of the table:

April May
TAT Time # Patients TAT Time # Patients
Transaction Type1 35 52 55 38
Transaction Type2 131 174 79 181
Transaction Type3 72 25 92 25
Transaction Type4 94 5 141 15
Transaction Type5 48 31 61 42
Transaction Type6 579 1 290 3
Transaction Type7 367 33 100 39
Transaction Type8 218 301 122 333
Overall Total 172(avg) 622(Count)102(Avg) 676(Count)