find the sum of deviations of all observations of the data 5 10 15 22 from their mean
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mean=( 5+10+15+22)/4=52/4=13
deviations=(5-13),(10-13),(15-13),(22-13)
-8,-3,2,9
sum of deviations= -8-3+2+9=0
deviations=(5-13),(10-13),(15-13),(22-13)
-8,-3,2,9
sum of deviations= -8-3+2+9=0
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