Aforecasting model has produced the following forecasts: period demand forecast     error abs. errorjanuary 120 110 february 110 115 march 115 120 april 125 115 fill in the blanks abovea. calculate the mean absolute deviation (mad) at the end of april. b. calculate the average error at the end of april. c. calculate the tracking signal at the end of april

John is a 45-year-old manager who enjoys playing basketball in his spare time with his teenage sons and their friends. at work he finds that he is better able to solve problems that come up because of his many years of experience, but while on the court, he finds he is not as good keeping track of the ball while worrying about the other players. john's experience is: