# Integrals, Marginal Cost Function and Marginal Profit

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The marginal cost function of producing q mountain bikes is

a) If the fixed cost in producing the bicycles is $2000, find the total cost to produce 30 bicycles

b) If the bikes are sold for $200 each, what is the profit (or loss) on the first 30 bicycles

c) Find the marginal profit on the 31st bicycle.

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##### Solution Summary

Integrals, Marginal Cost Function and Marginal Profit are investigated. The solution is detailed and well presented.

###### Education

- BSc , Wuhan Univ. China
- MA, Shandong Univ.

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- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
- "Thank you"
- "Thank you very much for your valuable time and assistance!"

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