Statistics: Find Mean and Standard Deviation of Sample Data

For the datain the following sample:
8, 1, 5, 1, 5

A. Find the meanand the standard deviation
B. Now change the score of x = 8 to X = 18, and find the new mean and standard deviation.
C. Describe how one extreme score influences the mean and standard deviation.

The solution finds the mean and standard deviation of sample data.