A gas station sells three grades of gasoline: regular, mid-grade, and premium. The price for each gasgrade are $3.03, $3.34, and $3.67 per gallon respectively. Let X1, X2, X3 be the amount of gas sold of each grade on a particular day. The amount of gas of each grade sold is independent and they have mean values of µx, = 1000, µx, = 500, and µX, = 300 and ox, = 100, ox, = 80, and ox, = 50 a) Find the mean revenue from all gas sales.bl Calouletefromoolo b) Calculate the variance from all gas sales. c) Calculate the standard deviation from all gas sales.