Population mean = 100. Standard Deviation = 16. Wh December 28, 2016 By Essaypros Population mean = 100. Standard Deviation = 16. What is the probability that a sample mean will be within + – 2 of the population mean for each of the following sample sizes? 50, 100, 200, 400 We Deliver Top Quality On Time As Promised! Ready to get started? Just click the button to be directed to a secure page so you can enter the details of your paper.