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x1=80,n1=?
x2=60,n2=1
rumus
xbar=x1.n1+x2.n2 / n1+n2
79 =80.n1+60.1 / n1+1
79(n1+1)=80n1+60
79n1+79=80n1+60
79-60=80n1-79n1
19=1n1
19 / 1= n1
19=n1