Final answer:
Seventh graders are likely to spend more hours playing sports than fifth graders.
Step-by-step explanation:
The two lists show the number of hours students in two grades spend playing sports each week. Based on the samples, the statement that is most likely true about all the students in these grades is A. A seventh grader is likely to spend more hours playing sports than a fifth grader.
This can be concluded because the maximum number of hours spent playing sports in Grade 7 is 10, while the maximum number of hours in Grade 5 is 7. Therefore, seventh graders generally spend more hours playing sports than fifth graders.