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cutegirl0987
cutegirl0987
17.04.2020 • 
Mathematics

A poll of 100 randomly selected investors showed that investments in a certain company gives on an
average 45% returns per year. Assume from past studies that the standard deviation is 8%. Find 90%
confidence interval for the average percent returns for all of the investors.
43.04 <<46.96
41.08 < x < 48.92
се
42.37 <
< 47.63
43.68 < <46.32

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