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それぞれ階級の真ん中の数×度数(人)を求めて
6×2 + 10×4 + 14×3 +18×1 =112
合計10だから112÷10=11.2
あってるかな?

ソラン♡

ありがとうございます😊助かりました٩(๑❛ᴗ❛๑)۶

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