The average rate of change in weight is 3/8.
According to the statement
Weight of baby during birth = 3 kg
Weight of baby after 8 months = 6 kg
Average rate of change of in weight is calculated by
Average rate = Increased weight - Real weight / Time period
Average rate = 6-3 / 8
Average rate = 3/8
So, the average rate of change in weight is 3/8.
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