Awebsite 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.