Four 6-sided dice are rolled. The dice are fair, so each one has equal prob- ability of producing a value in {1, 2, 3, 4, 5, 6}. Let X =the minimum of the four values rolled. (It is fine if more than one of the dice has the minimal value.) (a) What is P(X ≥ 1) ? (b) What is P(X ≥ 2) ? (b) What is the CDF of X i. e. P(X ≤ k) for all values of k ?