The mean of the entire population is usually represented by the Greek letter mu. A random sample of 100 employees is to be selected from this company. The expected value of X is EX µ and the variance of X is varX s2n.
As a further assumption we may be willing to assume that the X.
The x-bar is used to represent the sample mean. The weekly earnings of the 2480 employees of Sun Electric have a distibution with mean and standard deviation. The mean of the entire population is usually represented by the Greek letter mu. The mean of the sample mean barX that we have just computed is exactly the mean of the population.