Elena lists the ages of all of the Family members who live in our house below what is the mean absolute deviation of all their ages?

19

Step-by-step explanation:

We'll begin by calculating the mean of the data. This is illustrated below:

Mean = summation of data / number of data

Data from the question: 9, 13, 43, 55

Mean = (9 + 13 + 43 + 55)/4

Mean = 120/4

Mean = 30.

Now, we can calculate the mean absolute deviation (MAD) as follow:

MAD = summation of the absolute deviation from the mean / number of data.

MAD = [ |9–30| + |13–30| + |43–30| + |55–30| ] /4

MAD = [ 21 + 17 + 13 + 25] /4

MAD = 76/4

MAD = 19.

Therefore, the mea absolute deviation (MAD) of their ages is 19