An online bookstore is having a one-day sale. Softcover books are $4, hardcover books are $7, magazines are $3, and all digital downloads of books are $2.   Let's say 150 customers purchased books in one form or another that day. Below are the frequencies in which customers purchased books:   Books: Purchases: Softcover 42 Hardcover 28 Magazine 23 Digital Download 57 Based on the data above, which is the correct relative frequency with discrete random variable X = "the amount of money for a book?"     x P(X = x) 2 0.38 3 0.15 4 0.28 7 0.19 x P(X = x) 2 0.28 3 0.19 4 0.15 7 0.38 x P(X = x) 1 0.38 2 0.15 3 0.28 4 0.19 x P(X = x) 2 0.15 3 0.38 4 0.19 7 0.28

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