18. There are 24 books on the shelf. One-third of the books have a hardcover. The remaining books have a softcover. Among the softcover books, 50% of the books are horrors, 0.375% of the books are science fiction, and 0.125% of the books are fantasy books. Half of the hardcover books are science fiction books and the other half are fantasy books. Michael randomly picks one book from the shelf. Round your answers to three decimal places if necessary. a. Find the probability that a randomly picked book has a softcover. b. Find the probability that a randomly picked book is a science fiction book. c. Find the probability that a randomly picked book is a science fiction or horror book.