1. What is the lower limit of aforementioned interval?

2. What is the upper limit of aforementioned interval?

Consider a population made of 1,000,000 observations (N=1,000,000)--the population mean is equal to 10 (mu-10), and the population standard deviation is equal to 3 (sigma-3). From this population, we are going to pick up 1,000 random samples that each includes exactly 100 observations (n=100). Every time that we pick up a sample, we are going to compute and record the obtained sample means. That, in return, yields a sampling distribution of means with 1,000 sample means. (Confused with all the numbers? Read the above sentences one more time with greater care). Now consider a symmetric interval around the population mean that includes exactly 90% of all sample means.