Final answer:
To determine the number of students who scored higher than 25 on the test, count the leaves that are greater than 5 in the stem-and-leaf plot.
Step-by-step explanation:
To determine the number of students who scored higher than 25 on the test, look at the stem-and-leaf plot and find the stem value of 2. The leaves below the stem value of 2 represent the scores of the students. Count the number of leaves that are greater than 5, which indicates scores higher than 25. In this case, there are 8 leaves which means that 8 students scored higher than 25 on the test.