Linear regression where am i going wrong?

[Scarpetta]

linear regression where am i going wrong??

Linear regression using least square fit method for the
determination of cocaine sample
Cocaine (mg/ml) Peak height
X= 2.75 Y=27377 X squared=0.9625 X x Y=3241.272

M = 10 x 3241.272 – 2.75 x 27377 / 10 x 0.9625 – 7.5625

= -42874.03 / 2.0625 = -20787.39 ?

I should be getting m = 267.25 according to graph
Can anyone tell me where I am going wrong please

 

[CarlB]

Hey! Is helping you on this problem going to get us in trouble with the DEA?

Carl