Question: Here is the question I am trying to answer - Refer to the Lincolnville School District bus data. Information provided by manufacturers of school buses

Here is the question I am trying to answer -

Refer to the Lincolnville School District bus data. Information provided by manufacturers of school buses suggests the mean maintenance cost per year is $4,400 per bus

Specifically, what is the best way to calculate probability of mean annual maintenance

cost, or great given the manufacturer's data?

I have this answer so far, but would like to know if I am correct and if I am calculating it correctly. If not - why not, and where I am going wrong. Also the last part specifically about probability I am unsure about how to proceed. Here is what I have answered so far.

Chapter 8 Problem 48 -1.350585058 Z score 0.4115 8.85% Lincolnville is 8% above the mean for manufacturer maintenance bus cost 58.85%

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