Statistics - Median, Quartiles, Range and Interquartile Range

A survey is conducted to study the amount of daily pocket money (in dollars) of a group of students in a class. The results of the survey, in terms of \(x\), is as given in the data set \(\{x-3,\ x+2,\ x+7,\ x-6,\ x+4,\ x,\ x+5\}\), where \(x\ge6\).

Write down an expression for its

1. range,[1]
2. lower quartile.[2]