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

Question

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

anonymous · Answer

@agent0smith

agent0smith · Answer

You could use a calculator. Or wolfram. http://www.wolframalpha.com/input/?i=standard+deviation+of+12.5%2C+9.8%2C+13.5%2C+11.2%2C+12.3%2C+14.2%2C+11.7%2C+9.8%2C+12.6%2C+10.4