If 4 bags of flour with an average(arithmetic mean) weight o
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If 4 bags of flour with an average(arithmetic mean) weight of 15 pounds are put onto a shelf with 45-pound bags of flour,what is the average weight,in pounds,of all 8 bags on the shelf?
A.5 B.10 C.15 d.30 e.25
我算的是13.125.这个答案怎么选?
A.5 B.10 C.15 d.30 e.25
我算的是13.125.这个答案怎么选?
B.10
total weight = 15 x 4 + 5 x 4 = 80
the average weight = 80 / 8 = 10
total weight = 15 x 4 + 5 x 4 = 80
the average weight = 80 / 8 = 10
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