4. (3 pts.) Suppose you are checking the accuracy of a 200-1000 L air-displacement pipettor. You dispense and weigh 10 aliquots of 500L of water at 4C on an analytical balance. The mean value of the weight measurements of the water dispensed is 0.4973g. A) The nominal ("true") volume is 500L. What do you expect the mean value of the weight of the water to be? B) What is the accuracy of the pipettor (expressed as percent error) based on this result? C) The manufacturer specifies that the pipettor, at this nominal volume, should have an accuracy of at least +/4%. Does this pipettor meet the manufacturer's specifications