Answer:
19
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