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Mathematical questionnaire in life
( 1).x = 1 30(3×4+4×3+5×5+7× 1+8×4+9×2+ 1)

(2) 1500×6.2=9300 (ton)

∴ The monthly water consumption of this community is about 9,300 tons;

(3) It is reasonable to take the median or mode as the basic monthly water consumption, because it can not only meet the monthly water consumption of most families, but also guide families with water consumption higher than 7 tons to save water.