Question

The owner of a bookstore predicts that 30% of the books she sells each week are self-help books. To test this prediction, the owner randomly selects 150 books out of the total number of books sold for a week and records the type of each book. The table shows the results of samples taken for 2 separate weeks. Sample Fiction History Cooking Self-help Total week 1 50 29 37 34 150 week 2 55 31 34 30 150 Based on these samples, is the owner's prediction correct? Select from the drop-down menus to correctly answer the question. The owner's prediction is . Based on the samples, about of the books sold each week are self-help books.

Answer 1

The owner's prediction is incorrect. About 23% of the books sold are self-help books.

34 out of the 150 sold in week 1 were self-help books.
34 out of the 150 sold in week 2 were self-help books.

This gives us 68 self-help books out of 300 books sold.

68/300 = 0.2267 ≈ 0.23 = 23%