1. what is the mean of the data set?
{11, 14, 15, 16, 16, 18, 20, 20, 22, 22}

2. what is the interquartile range of the data set?
{40, 48, 62, 60, 62, 40, 25, 50, 20, 30, 55}

3. what is the mean absolute deviation of the data set?
{21, 22, 24, 26, 27, 28, 20, 30}

4. what is the median of the data set?
{50, 54, 62, 48, 49, 52}