For the data set 3,3,9,12,13, the mean is 8.what is the mean absolute deviation? a. the mean absolute deviation is 5. b. the mean absolute deviation is 20. c. the mean absolute deviation is 4. d. the mean absolute deviation is 8.

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204