The mean of number 20,30,40,x,x+10,70,80,90,is 110. find the missing number.
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Answer:
mean = sum / no of terms = 20+30+40+x+x+10+70+80+90 / 8
110 = 340+2x/8
880 = 340+2x
880-340 = 2x
540/2 = x
270 =x
a0079:
thanks you your ans is right
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