hitung nilai rata-rata
[tex]Rata-Rata=\frac{(42x3)+(44xk)+(46x12)+(48x10)+(50x5)+(52x2)}{3+k+12+10+5+2} \\\\46,6=\frac{126+44k+552+480+250+104}{32+k} \\\\46,6 (32+k)=1.512+44k\\\\1.491,2 +46,6k=1.512+44k\\\\46,6k-44k=1.512-1.491,2\\\\2,6k=20,8\\\\k=\frac{20,8}{2,6} \\\\k=8[/tex]
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