if the arithmetic mean between x and 7 is 9.then what is x.
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Arithmetic mean =sum of all observations/no.of all observations
9 =x+7/2
x+7 =9×2
x+7 =18
x =18-7
x =11
x value =11
9 =x+7/2
x+7 =9×2
x+7 =18
x =18-7
x =11
x value =11
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