A Website Advertises Job Openings on Its Website,but Job Seekers

Multiple Choice

A website advertises job openings on its website,but job seekers have to pay to access the list of job openings.The website recently completed a survey to estimate the number of days it takes to find a new job using their service.It took the last 30 customers an average of 60 days to find a job.Assume the population standard deviation is 10 days.Calculate a 95% confidence interval of the population mean number of days it takes to find a job.

A) [40.4000,79.6000]
B) [55.9085,64.0915]
C) [56.4215,63.5785]
D) [56.9966,63.0034]