<PRE><B>Question 1154146</B>
First find mean (600+ 470+170 + 300 + 200)/5

Mean =348 

Find variance
 Find the difference between observation and mean

           d        
600-348 = 252       
470-348 = 122
170-348 = -178
300 -348 = -48
200-348  = -148

Variance {{{(sigma)^2}}} = ((252)^2 +(122)^2+(-178)^2+(-48)^2+(-148)^2)/5

{{{(sigma)^2}}} = 26856


Standard deviation {{{(sigma)}}}= {{{sqrt(26856)}}}
=163.88


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