Two lab partners performed an analysis to determine the concentration of fiuoride in drinking water. As part of the analysis, they prepared and analyzed six standards with known fluoride concentrations and then made the following calibration curve. Upon seeing the results, one lab partner wants to remove the 75 and 90ppm standards from the calibration curve before continuing with their calculations. The other partner wants to keep all six standards. Which version of the calibration curve should the partners use if they want to obtain accurate results when assessing their drinking water samples? Why