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 IQR is the length of the box in your box-and-whisker plot. An outlier is any value that lies more than one and a half times the length of the box from either end of the box.That is, if a data point is below Q 1 â 1.5ÃIQR or above Q 3 + 1.5ÃIQR, it is viewed as being too far from the central values to be reasonable.ections: Quartiles, boxes, and whiskers, Five-number summary, Interquartile ranges and outliers. The  interquartile range, abbreviated  IQR , is just the width of the box in the box-and-whisker plot.