the table below is Q the quantity, AC is the average cost, AC$\text{'}$ is the derivative of the average cost with respect to quantity, and MC is the marginal cost.

What must the missing number be$?$

Define the answer as Python variable MC$.$

Run the cell below to check that the format is correct

assert all $($type$($i$)$ in $[$int$,$ float, np$.$int$64,$ np$.$float$64]$ for i in $[$MC$]),$ 'The answers must be given as numbers'$)$