Ok so Interquartile range. In descriptive statistics, the interquartile range (IQR), also called the midspread or middle 50%, or technically H-spread, is a measure of statistical dispersion, being equal to the difference between 75th and 25th percentiles, or between upper and lower quartiles, IQR = Q3 − Q1.
To find it you have to make a box and whisker plot and find the lower and upper quartiles. Once you do that you subtract the upper quartile from the lower and you have the interquartile range.
I'm a little unsure about this one, but I believe that scale factor is the rule that yields dilution, as it specifies how the diluted figure is placed on the graphing plane.
