The mean weight of 75 2nd graders is 55.7 lbs and

the mean weight of 25 1st graders is 42.6 lb.
What is the mean weight of the 100 children

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  1. The mean weight of 75 2nd graders is 55.7 lbs andthe mean weight of 25 1st graders is 42.6 lb. What is the mean weight of the
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  3. The mean weight of 75 2nd graders is 55.7 lbs andthe mean weight of 25 1st graders is 42.6 lb. What is the mean weight of the
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