Suppose the orders are uniformly made over the last 100 days, and we have 5000 orders made in the last 100 days in total, can you estimate the cardinality of the output of σ(ShipDate > :today-60) Order (i.e. number of records in the output of σ(ShipDate > :today-60) Order)?
5000*0.4
5000*0.6
5000*1
5000*0.01