he following data represent a set of 10 experimental runs in which
two independent variables X1 and X2 are controlled and values of a response Y
are observed:
	Y	X1	X2
	61.5	2400	54.5
	61.2	2450	56.4
	32	2500	43.2
	52.5	2700	65.2
	31.5	2750	45.5
	22.5	2800	47.5
	53	2900	65
	56.8	3000	66.5
	34.8	3100	57.3
	52.7	3200	68

Estimate the multiple Linear regression, Y=a+b1X1+b2X2

3. The regression estimate a