The price of a first class postage stamp was raised from 37 cents to 39 cents on Jan. 8, 2006. The change followed the approval of a Postal Rate Commission recommendation to raise prices on all classes of mail approximately 5.4 percent.
The interquartile range (IQR) is a measure of variability, based on dividing a data set into quartiles. Quartiles divide a rank-ordered data set into four equal parts.he interquartile range (IQR) is a measure of variability, based on dividing a data set into quartiles. Quartiles divide a rank-ordered data set into four equal parts.
The interquartile range (IQR) is a measure of statistical dispersion, or variability, based on dividing a data set into quartiles. Calculate interquartile range based on a given data set. The interquartile range is equal to the difference between the upper and lower quartiles: IQR = Q3 â Q1.