What is the estimated mean absolute deviation of the population? {76,67,80,83,79,76,76,82,82

You can't really say the absolute deviation of the population to me but if you wanted to you could

The mean is 77.9 so subtract each number from the mean (if it’s negative just keep the number the same and change it to positive). Once you have subtracted the mean from all the numbers (or vise versa as long as it’s positive) add the differences together and find the mean of them. There’s your answer. ☺️