i need help with this, im so confused

By definition, the mean value ux of a random variable x with probability density function p(x) is Ux = J _xp(x)dx Likewise, the definition of the variance oz is (x- Mx)2p(x)dx -00 Also, ox = x2 - ux 1. A random process x has a uniform distribution between x=1 and x=3. (a) (5%) What is the mean value of x? Ux =? (b) (5%) What is variance of x? o? = ? (c) (5%) What is the standard deviation of x? Ox =? (d) (5%) What is the mean square value of x? x2 = ? (e) (5%) What is the probability that a trial value of x is between 1.5 and 2.5