Question 19

Explanation

First, let's calculate the total exam score for Semester $I$:

Next, we calculate the total exam score for the whole year (Semester $I$ & $II$):

To find the total exam score for Semester $II$, we subtract the Semester $I$ total from the yearly total:

The number of exams in Semester $II$ is the difference between the total exams and Semester $I$ exams:

Now we can calculate the average score for Semester $II$:

Finally, we calculate the increase in the average score from Semester $I$ to Semester $II$:

Therefore, the increase in Hani's mathematics exam average is $0.92$.