1.  Jessica performed an analysis on some water from Bigtown Lake. She tested five samples and found the lead concentrations to be in parts per million (micrograms per milliliter or mg per liter) to be1.004,1.048,0.026,0.018, and1.028respectively. What was the average mass of lead? Round your answer to the nearest thousandth.

 2.  Sydney is concentrating a sample by distillation. She started with110ml d'une solution qui était environ0.12% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to60ml. What percent of the solution after distillation is inorganic salts? Round your answer to the nearest hundredth of a percent.

