Question: I solved a problem below my answer is Standard Deviation 1608.16 and NPV is 1486.40. But our teacher said that the correct answer is Standard

I solved a problem below my answer is Standard Deviation 1608.16 and NPV is 1486.40. But our teacher said that the correct answer is
Standard Deviation is 1,344.04
Expected NPV is -22.77.
Can you give me the detailed computation on how to solve the correct answer, please use excel file if possible?

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