In a large class the midterm test scores had an average of 50 points with an SD of 22. The final test scores averaged out to 60 with an SD of 20. The correlation between the midterm and final scores was 0.60. The scatter diagram of the two sets of scores is football shaped. Of the students who scored around 50 in the midterm, about what percentage were in the top 25% of the class in the final.