Hi

x	y	(x-2.5)	 (y-1.125)Product(x-2.5)^2

1	0.45	-1.5	-0.675	1.0125	2.25

2	0.9	-0.5	-0.225	0.1125	0.25

3	1.35	0.5	0.225	0.1125	0.25

4	1.8	1.5	0.675	1.0125	2.25

10	4.5	0	0	2.25	5

2.5	1.125									

y = ax + b

 a = 2.25/5 = .45

 b = 1.125 - .45*2.5 = 0

y = .45x , when x = 9, y = $3.60

Or use Excel Scatter Plot capbilities

. 

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