What is the mad of the data set? {13, 6, 3, 7, 11}

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

11. minitab software was used to find the lsrl for a study between x=age and y=days after arthroscopic shoulder surgery until an athlete could return to their sport. use the output to determine the prediction model and correlation between these two variables. predictor coef se coef t p constant -5.054 4.355 -1.16 0.279 age 0.2715 0.1427 1.9 0.094 r-sq = 31.16%

How do you solve a question like this?