I have the below expressions that I want to plot on a graph (it returns an amount of time). I want the graph to plot the Maximum available "Week" (which is a field in my table) and then the previous n weeks (will probably be 13 but I should be able to change it in the expression)
sum(if(Left(TaskType,4)='PACK',WorkTimeAverage))/sum(if(Left(TaskType,4)='PACK',LineQty))