Question: I don't understand where we get z in the problem 640+/- z*90/sort of 10. Question 1: You want to rent an unfurnished one-bedroom apartment for

I don't understand where we get z in the problem 640+/- z*90/sort of 10.

Question 1: You want to rent an unfurnished one-bedroom apartment for next semester. The mean monthly rent for a random sample of 10 apartments advertised in the local newspaper is $640. Assume that the standard deviation is $90. Find a 95% confidence interval for the mean monthly rent of an apartment.

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