Groundwater is the main source of water in many countries. In a study of the quality of ground water in Yemen, the authors of a paper - used a multiple regression model with two independent variables, where y = Chloride concentrations (mg/L) x1 = Total alkalinity x2 = Electrical conductivity The model equation suggested in the paper is y = 183.560 + 1.589x1 + 0.069x2 + e A). based on this model, what is the mean value of y when x1 = 300 and x2 = 2500? B). Based on this model what mean chloride concentration is associated with a total alkalinity of 230 and an electrical conductivity of 2700?