1)mean=jumlah seluruh data/banyak data=(143×5)+(144×7)+(145×4)+(146×8)(147×6)/5=715+1.008+580+1.168+882/5=4.353/5=870,6
2)mean=jumlah seluruh data/banyak data=(25×2)+(35×2)+(40×2)+(45×1)/7=30+70+80+45/7=225/7=32,142
maaf kalo salah
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1)mean=jumlah seluruh data/banyak data=(143×5)+(144×7)+(145×4)+(146×8)(147×6)/5=715+1.008+580+1.168+882/5=4.353/5=870,6
2)mean=jumlah seluruh data/banyak data=(25×2)+(35×2)+(40×2)+(45×1)/7=30+70+80+45/7=225/7=32,142
maaf kalo salah