What is the mean absolute deviation for the data set

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Acircle has a circumference of 28.36 units what is the diameter of the circle