math
posted by Dan .
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
a. Compute the range.
b. Compute the mean deviation.
c. Compute the standard deviation.

http://www.purplemath.com/modules/meanmode.htm
http://www.google.com/search?rlz=1C1GGLS_enUSUS292&sourceid=chrome&ie=UTF8&q=mean+deviation
http://www.google.com/search?hl=en&rlz=1C1GGLS_enUSUS292&q=standard+deviation&btnG=Search
Let us know what you come up with. 
Range=123=9
Mean=(12+6+7+3+10)/5=7.6
Mean Deviation=[(127.6)+(7.66)+(7.67)+(7.63)+(107.6)]/5 = 13.6/5=2.72
Standard Deviation=sqrt=[(127.6)^2(7.66)^2+(7.67)^2+(7.63)^2+(107.6)^2]/(51)=sqrt[19.36+2.56+0.36+21.16+ 5.76]/4=sqrt[12.3]=3.51