the means of x1, x2 is 7.5 and the mean of x1, x2 and x3 is 8. find x3
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x1+x2+x3 = 8×3... 1
x1+x2 = 7.5(2)... 2...
x1+x2+x3=24...
x1+x2=15...
sub...
15+x3=24....
x3 = 9...
HOPE IT HELPS......