rata rata ((5×4)+(6×6)+(7×12)+(8×7)+(9×6)+(10×5))÷(4+6+12+7+6+5)
=(20+36+84+56+54+50)÷40
=300÷40=7,5
median=7
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rata rata ((5×4)+(6×6)+(7×12)+(8×7)+(9×6)+(10×5))÷(4+6+12+7+6+5)
=(20+36+84+56+54+50)÷40
=300÷40=7,5
median=7