The Following Chart Gives the Number of Full Years Served

Multiple Choice

The following chart gives the number of full years served by the first 42 presidents of the United States (up to and including George W.Bush) .What is the standard deviation of full years served by the first 42 presidents of the United States? Remember that this includes all of the presidents.

A) 2.0 years
B) 4.0 years
C) 5.2 years
D) 6.5 years
E) 8.3 years