If mean of observation x,x+3,x+5,x+7,x+10 is 9 find mean of first three observations
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x+x+3+x+5+x+7+x+10÷5=9
25÷5+5x=9
5+5x=9
5x=9-5
x=4÷5
Find x yourself and put it in observations
And find mean of first three observations
Thank you for points
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