Question

he two-way table shows the number of books of each type in Eliza’s home.

A 5-column table has 3 rows. The first column has entries hardcover, paperback, total. The second column is labeled Fiction with entries 28, 4, 32. The third column is labeled biographies with entries 2, 1, 3. The fourth column is labeled Reference with entries 10, 15, 25. The fifth column is labeled Total with entries 40, 20, 60.

What is the probability that a randomly selected reference book is hardcover?

0.25
0.4
0.6
0.75

Answer 1

There are 10 hardcover reference books out of 25 reference books, so the probability is 10/25 = 0.4.