
Concept explainers
Growth of a baby. Use the graph of boys’ median weight in Exercises 35 to estimate;
a. a) the average growth rate of a boy during his first 15 months. (Your answer should be in pounds per month.)
b. b) the average growth rate of a boy during his second 15 months. (Your answer should be in pounds per month.)
c. c) The average growth rate of a boy during his first 30 months. (Your answer should be in pounds per month.)
d. d) Based on your answer in part (a)-(c) and the graph, estimate the growth rate of a typical boy at exactly 15 months, and explain how you arrived at this figure.

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