I am sure this is an easy one but I don't get how to get this right.
Consider the visualisations and the data below. For Month 1, the totalt hours is 12 which equals 4 hrs per person. However the average is calculated as 3 since there are 2 rows for Jack, hence 12/4=3 I guess. For month 2 the average is calculated correctly as 15/3 as there are only one row per person and month. How can I get an average for the total time for month 1, eg. 4 hrs per person?