The Costello Music Company has been in business for five years. During that time, sales of pianos increased from 12 units in the first year to 76 units in the most recent year. Fred Costello, the firm's owner, wants to develop a forecast of piano sales for the coming year. The historical data follow.
Year | 1 | 2 | 3 | 4 | 5 |
Sales | 12 | 28 | 34 | 50 | 76 |
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