The upper and lower quartiles can be used to find another measure of variation call the interquartile range. The interquartile range or IQR is the range of the middle half of a set of data. It is the difference between theupper quartile and the lower quartile.
You just need to divide the yearly salary by the number of weeks per year to get
48000/52 weeks=923 is the amount that she should spend no more than one week's pay which is the maximum amount per month that she can spend on rent.
