The height (in feet) of a sample of trees in the school playground:
12.5, 9.8, 13.5, 11.2, 12.3, 14.2, 11.7, 9.8, 12.6, 10.4
What is the mean and standard deviation?

A. mean = 11.8 ft; standard deviation = 4.52 ft
B. mean = 13.1 ft; standard deviation = 1.43 ft
C. mean = 11.8 ft; standard deviation = 1.43 ft
D. mean = 11.8 ft; standard deviation = 4.52 ft