I can't understand this i need help badly

Question

In a​ poll, 37​% of the people polled answered yes to the question​ "Are you in favor of the death penalty for a person convicted of​ murder?" The margin of error in the poll was 2​%, and the estimate was made with 96​%

confidence. At least how many people were​ surveyed?

Answer 1

One is supplied here with a value for the sample proportion p (37% or 0.37) and a Margin Of Error E

(2% or 0.02) and can gain (1 − p) as 0.63 as well as a confidence level of z_0.96 which corresponds to

2.05 in the Normal Distribution.

He can then follow the formula n = p(1 − p)z_c² ÷ E²

to reach n equal to 0.37(1 − 0.37)(2.05)² divided by 0.02².

This gives the minimum sample size sought as 2449.006875 which is rounded forward to 2450.