The mean of observation 11,12,14,18,x+2,20,22,25 and 61 is 21. Find the value of x
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(11+12+14+18+x+2+20+22+25+61)/9=21.
185+x=21*9.
185+x=189.
x=189-185.
x=4.
185+x=21*9.
185+x=189.
x=189-185.
x=4.
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