A sample of 12 measurements has a mean of 30 and a standard deviation of 4.75. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 30 each.
A. Find the mean of the sample of 14 measurements.
Mean = 30
B. Find the standard deviation of the sample of 14 measurements.
Standard Deviation =
I need help calculating the standard deviation for this problem.