Finding the sample mean is no different from finding the average of a set of numbers. I have many more StatCrunch videos. Difference between two means with summary data.
Z x-m s where m is the population mean and s is the population standard deviation.
This is a quick video on how to use Statcrunch to create a grouped sample mean. If you dont know the population standard deviation or the sample size is below 6 you should use a t-score instead of a z-score. A typical MyStatLab problem for finding the required minimum sample size for a given confidence level and margin of error. HttpsgooglJQ8NysMean Standard Deviation and Variance in StatCrunch.