In a Statistics class, 18% of students get As, 32% of students get Bs, 25% of students get Cs, 15% of students get Ds, and 10% of students get Fs. An A is worth 4 points, a B is worth 3 points, a C is worth 2 points, a D is worth 1 point, and an F is worth 0 points. Let X be the earning points. Find the probability distribution and the expected value of X.