Standard Deviation VI

[kluevehe]

Hi All

• Which of the following data sets has the smallest standard deviation?

a)31,32,32,30,30,25,33,28 A
b)35,38,38,32,30,17,40,25
c)37,41,41,33,31,12,43,24
d)38,44,44,34,31,8,46,23
e)33,35,35,31,30,21,36,27

The answer is A - is there someone who knows a 10 sec. way?

[prreeet]

look at the range : 25-32, 17-40, 12-43, 8-46, 21-36 for a,b,c,d,e
go for teh smallest one when mean are kind of same and # of data elements are kind of same