how to solve this in excel from a data which consists of ID$,$ Med, Admin date and Units $4.$ In each month separately $($September$,$ October, and November$)$ and also all together across these $3$ months, how many patients are switched from Med A to Med B$?$ In each month separately $($Sept$,$ Oct, Nov$),$ how many patients are started on Med B having not been on Med A before? $5.$ In each month separately $($September$,$ October, and November$)$ and across all $3$ months, for patients switched to Med B$,$ what is the average number of weeks the patients were on Med A before being switched to Med B$?($see time on medication definition below$)6.$ What is the average total monthly dose per patient per month $($in patients that switched$)$ of Medication A before switching to Medication B $($use time from question $5)?$ What is the average total monthly dose per patient per month of Medication B $($in patients that switched $$ assume Med B dose is for $1$ month$)?$