Water Resources and Environment. The jurisdiction of the Subcommittee on Water Resources and Environment consists generally of matters relating to water resources development, conservation and management, water pollution control and water infrastructure, and hazardous waste cleanup.
A pennyweight (abbreviated dwt) is a unit of mass that is equal to 24 grains, 1â20 of a troy ounce, 1â240 of a troy pound, approximately 0.054857 avoirdupois ounce and exactly 1.55517384 grams.
The error in measurement for each lighter penny is $.05$ grams since the scale measures to the nearest tenth of a gram. So with $28$ of the lighter pennies their possible weight could be off by $28 \times 0.05 = 1.4$ grams.