The number of customers for the first 6 weeks of 2021 is shown in the table. # of customers Week 1 75 72 2 3 O AN 80 58 4 5 73 6 77 You like to forecast the number of customers for week 7 using the data. You decided to use a weighted moving average method to find this forecast. If you use the weight of 20 on week 6, 15 one week ago, 15 two weeks ago and 10 three weeks ago, what is the forecast for week 7