Can somebody please help me!!

Reduce fractions expressing probability to lowest terms. in 3,000 repetitions of an experiment, a random event occurred in 500 cases. the expected probability of this event is?

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2