Question: How do you solve this problem, step by step without using excel? Everywhere online uses excel and we cannot, so I would like to know

How do you solve this problem, step by step without using excel? Everywhere online uses excel and we cannot, so I would like to know how to properly solve it *step by step by hand with simple calculator.
Solved Problem 1 Chicken Palace periodically offers carryout five-piece chicken dinners at special prices. Let Y be the number of dinners sold and X be the price. Based on the historical observations and calculations in the following table, determine the regression equation, correlation coefficient, and coefficient of determination. How many dinners can Chicken Palace expect to sell at $3.00 each? Observation Price (X) Dinners Sold (Y) 1 760 2 $2.70 $3.50 $2.00 510 3 980 4 250 5 320 6 $4.20 $3.10 $4.05 $19.55 $3.258 480 Total 3,300 Average 550Step by Step Solution
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