Safe Spirit sells novelty hats in New York City. The company uses a simple mean to forecast monthly sales. The forecast of sales for month six was $5000 obtained by averaging past 5 months sales. Sales from months one to four were; $6000, $7000, $4000, and $5000. However, the sales assistant accidently deleted the sale data for month 5 in the system. Now, the sales manager wants to determine sales for month five from the remaining data. How would she do that?