Question

A cloth shop owner sells mattresses which he gets from a company. His sale for 3 weeks are given below. He expects that around 50 mattresses to be sold every day:
Day 1st Week 2nd Week 3rd Week
Sun 60 81 79
Mon 70 72 89
Tue 25 40 57
Wed 52 50 74
Thu 42 52 67
Fri 57 54 65
Sat 63 60 47
Based on the data study one forecasting error based on moving av