need help please with question.

Twenty-nine fast-food restaurant hourly employees were surveyed to see how many hours they worked per week, on average. The following data was obtained:

36, 49, 22, 47, 31, 16, 18, 30, 22, 22, 41, 27, 19, 37, 45, 21, 33, 17, 31, 34, 22, 29, 25, 24, 21, 34, 34, 25, 26

Assuming the population standard deviation is=9

, construct a 90% confidence interval for the mean number of hours per week that the population of fast-food restaurant employees work.

x= 28.8965517241379

--- = 0.05

2

z

--- = 1.64485362695147

2

Margin of Error:E= need this

We are 90% confident that fast-food restaurant hourly employees, on average, work betweenneed this one

hours andneed this answer ,hours per week.