Plzzz what is the mean for the data set 582, 505, 548, 578, 511, 506, 521, 546, 570. express your answer as a decimal to the nearest tenth

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?