Find E(x), E(x²), the mean, the variance, and the standard deviation of the random van whose probability density function is given below. f(x)= x. [0,48] 1 1152 E(x)-(Type an integer or a simplified fraction.) E(x2)-(Type an integer or a simplified fraction.) -(Type an integer or a simplified fraction.) ²-(Type an integer or a simplified fraction.) 0= (Type an exact answer, using radicals as needed.)