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.
What is inter-quartile range (iqr) - Definition and Meaning. Inter-quartile Range (IQR) : It is used for the statistical calculations of set of data which is divided into 4 equal parts. IQR is the difference between the third and first quartiles. Formula : IQR = Q3 â Q1, here Q3 is third quartile, Q1 is first quartile.