Football or basketball means we add the pupils who chose either sport.<br><br>&bull; From the diagram, count pupils who chose football.<br>&bull; Count pupils who chose basketball.<br>&bull; Add the two numbers together.<br>&bull; Write the fraction over the total number of pupils.<br><br>From the diagram, 5 out of 9 pupils chose football or basketball.<br><br>Final Answer: \(\frac{5}{9}\)