A group of 4th graders has a mean weight of 81 lbs, standard…

A group of 4th graders has a mean weight of 81 lbs, standard deviation of 12 lbs.  If a randomly chosen student weighs 97 lbs, would their weight be considered usual or unusual?  1.  Calculate the z-score 2.  State if the weight would be usual/unusual 3.  Justify your answer.