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一群小木偶,其中3个的平均身高是50厘米,另4个的平均身高是57厘米,请问这群小木偶的平均身高是多少厘米?
A group of puppets, of which three average height is 50 cm, the other four average height is 57 cm, may I ask how many centimeters the average height of these puppets?