In recent years the Weibull distribution has been used to model engine emisions of various pollutants. Let X denote the amount of carbon monoxide emission (in grams/ gallon) for a randomly selected engine of a certain type. X can be modeled with a Weibull distribution with parameters alpha =1.5 and beta =3. What is the expected (or mean) amount of carbon monoxide emmited by this type of engine? ( round to two decimal places).