30,35,38,40,x+3,55,60,64is 47 . find the value of x observation
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median=30,35,38,40,44,x+3,55,60,64,68
47=44+x+3/2
47×2=47+x
94=47+x
x=94-47=47
therefore, x=47
6th observation =x+3=47+3=50
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