The sixth-grade chorus has a boy-to-girl ratio of 3 : 8. Which of the following ratios is equivalent to this ratio? A.15 boys to 55 girls B.55 boys to 15 girls C.40 boys to 15 girls D.15 boys to 40 girls

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%