B. GROUPED DATA. The table below shows the age of the workers employed in a manufacturing company. Complete the table, then determine the (1) range, (2) mean, (3) mean absolute deviation, (4) sample and population variance, (5) sample and population standard deviation (5) coefficient of variation, (6) quartile deviation and (7) percentile range. X (class Ages fcm mark) (x - X) f(x - x) (x - x) 2 f ( x - * ) 2