On saturday henry spent 1 1/2 hours cutting the grass,1 3/4 hours pulling weeds and, 2 hours sweeping and bagging the weeds. in all, how much time did he spend on yard work?

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.