A production facility employs 18 workers on shift A, 15 workers on the shift B, and 12 workers on the shift C. A quality control consultant will conduct in-depth interviews with 8 of these workers. Those interviewed are randomly selected from the population of 45 workers at the facility. How many different groups of 8 workers can be selected for interviews so that all 8 come from the same shift?

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%