Question

Find P(Y|B) from the information in the table.

A 5-column table has 4 rows. The first column has entries A, B, C, Total. The second column is labeled X with entries 8, 6, 23, 37. The third column is labeled Y with entries 80, 34, 56, 170. The fourth column is labeled Z with entries 40, 45, 32, 117. The fifth column is labeled Total with entries 128, 85, 111, 324.

To the nearest tenth, what is the value of P(Y|B)?

0.2
0.3
0.4
0.5

Answer 1

P(Y|B) = (number in row B and column Y) / (total in row B) = 34 / 85 = 0.4.

Answer: 0.4