Question 696731: Please help!
For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation:
8, –5, 7, –10, 5
Answer by mathbird(71)   (Show Source):
You can put this solution on YOUR website! 8, –5, 7, –10, 5
a)mean=(8-5+7-10+5)/5
mean=5/5=1
b)median:arrange the data
-10,-5,5,7,8
median=(n+1)/2 :where n=no. of obs.
=(5+1)/2=3 obs
=5 ans
c)sum of squared deviation (from mean)
=(8-5)^2+(-5-5)^2+(7-5)^2+(-10-5)^2+(5+5)^2/5
=9+100+4+225+100/5
=438/5
=87.6
D)standard deviation=s^2=summation(x-mean x)^2/n-1
(8-5)^2+(-5-5)^2+(7-5)^2+(-10-5)^2+(5+5)^2/4
=438/4
=109.5
E)variance=sq(109.5)
=10.46
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