An analyst is to determine the molarity of a NaOH solution. Three aliquots of standard KHP are weighed out: 0.3078 g, 0.4967 g, and 0.3821 g. These three aliquots were titrated using a NaOH solution and required 14.86 mL, 24.65 mL, and 19.16 mL, respectively. From these data calculate the average molarity of the NaOH solution.