Natural numbers will be whole numbers. Integers will ___ be natural numbers. Irrational numbers will ___ be real numbers. Rational numbers will be irrational numbers. Rational numbers will __ integers.. Fill in the blank in each sentence with either "Always", "sometimes", "never"

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?