Question: I need a step by step walk through the below example. I am getting lost after this z= (9-10) / (2 / sqrt 64) =

I need a step by step walk through the below example. I am getting lost after this z= (9-10) / (2 / sqrt 64) = .25 do I look up the .25 on z table? I need a walk through. Thanks

A company that manufactures bookcases finds that the average time it takes an employee to build a bookcase is 10 hours with a standard deviation of 2 hours.A random sample of 64 employees is taken.What is the likelihood that the sample mean will be 9 hours or more?

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