Mrs. Orlof teaches two history classes, one in th morning and one in the afternoon. Yesterday she gave the same test to both classes. Anyone who failed the test must take a retest. Since a greater percentage of students who took the morning test failed the test than students who took the afternoon test, more of Orlof's morning history students than afternoon history students will have to take the retest.

-more students in the morning class may have passed the test than failed the test
-some students may have been absent from both classes
-some of the students who passed the afternoon test may have received information about the test from morning students
-more students may have taken the test in the afternoon than in the morning.

To answer the question, we need to consider the information provided in the passage:

1. More students in the morning class may have passed the test than failed the test: This means that the percentage of students who failed the morning test is greater, but it does not necessarily mean that more students failed compared to the afternoon class.

2. Some students may have been absent from both classes: This is important because absent students cannot take the test or the retest. It affects the total number of students who will be taking the retest.

3. Some of the students who passed the afternoon test may have received information about the test from morning students: This implies that the afternoon students had an advantage as they had prior knowledge of the questions. This could lead to a higher percentage of students passing the afternoon test.

4. More students may have taken the test in the afternoon than in the morning: The total number of students taking the test in each class can affect the percentage of students who pass or fail.

Considering these factors, we can conclude that more students from the morning class will have to take the retest compared to the afternoon class. However, without specific numbers or percentages, it is not possible to determine the exact difference in the number of students who failed the test in each class.