Use a calculator to find the mean and standard deviation of the data. Round to the nearest tenth.
20, 16, 18, 9, 20, 16,14

A. mean=15.9 standard deviation= 3.6
B. mean= 16 standard deviation= 12.7
C. mean= 16.1 standard deviation= 3.6
D. mean= 16.1 standard deviation= 12.7