Question: I need more explanation on a question that I found the answer to on Course Hero. I am not sure how to ask the question

I need more explanation on a question that I found the answer to on Course Hero. I am not sure how to ask the question without copy and pasting the question and solution so am attempting to direct you to the question via this link. https://www.coursehero.com/tutors-problems/Statistics-and-Probability/35970989-In-a-survey-carried-out-in-a-large-city-170-households-out-of-a/

My question is in regards to the z value. What is the calculation for the answer that results in 1.96?

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