Starting at home, Luis traveled uphill to the hardware store for 30 minutes at just 8mph. He traveled back along the same path at a speed of 24mph. What is his average speed for the entire trip from home to the hardware store and back?

Harold took five different samples of thirty-five randomly selected students from the 520 students he surveyed. the means of the samples are shown below. sample mean sample 1: 3.4 sample 2: 3.2 sample 3: 4.1 sample 4: 4.6 sample 5: 3.1 the predicted mean of the population will fall between 3.1 and ?