The average weight loss is 0.739 mg/s.
The total weight lost by the individual = 15 lb
To convert Ib to mg
1 Ib = 453592 mg
15 lb = 15 lb * 453592 mg/ 1 Ib
= 6803880 mg
The time taken for the weight loss = 3.5 months
Number of seconds in 3.5 months = 9.198 * 10^6 seconds
Hence;
Average weight loss in milligrams per second (mg/s);
Weight lost/ time taken
6803880 mg/9.198 * 10^6 seconds
= 0.739 mg/s
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