CELL PHONES The table shows the number of contacts eight friends have stored in each of their cell phones. 1. Find the mean of the data. 2. What is the difference between the data value 52 and the mean? 3. Which value is farthest from the mean? 4. Overall, are the data values close to the mean or far away from the mean? Explain. You have used the interquartile range which describes the variability of a set of data. Another way to describe the variability of a set of data is to use its mean absolute deviation. The mean absolute deviation of a set of data is the average distance between each data value and the mean.