Question: 1.21 Assume that C represents the average cost for n, wells drilled to a mean depth, D,, and that C varies approximately exponentially with

1.21 Assume that C represents the average cost for n, wells drilled to a mean depth, D,, and that C varies approximately exponentially with depth such that an expression C=qebD can be used to curve fit N observed values of ni, C, and D. If we define a residual error, r, as InG, r=n; In C it is possible to determine the constants a and b using the N observed values of n,, Di, and C; such that the sum of the residuals squared has a minimum value. Derive expressions for a and b that result in a minimum value of . 7. (= 1
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