19. A box contains 47 red marbles, 57 white marbles, and 54 blue marbles.

If a marble is randomly selected from the box, what is the probability that it is white or blue? Express your answer as a simplified fraction or a decimal rounded to four decimal places.

20.

Write out the sample space for the given experiment. Use the letter H to indicate heads and T for tails.

2 coins are tossed.

21. Lindsay is checking out books at the library, and she is primarily interested in mysteries and nonfiction. She has narrowed her selections down tonine mysteries and ten nonfiction books. If she randomly chooses three books from her selections, what's the probability that they will all be nonfiction? Enter a fraction or round your answer to 4 decimal places, if necessary.

22. A standard six-sided die is rolled.

What is the probability of rolling a number less than 4? Express your answer as a simplified fraction or a decimal rounded to four decimal places.

23. A standard pair of six-sided dice is rolled. What is the probability of rolling a sum greater than 4? Express your answer as a fraction or a decimal number rounded to four decimal places.