Mark scored 21 points for the home team in a baseball game. His teammates as a group scored p points. Write an equation to represent this situation. Plz help

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics