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.
IQ testing is a method used by psychologists to measure what is generally considered intelligence. The concept of IQ, or Intelligence Quotient was first introduced by French psychologist Alfred Binet in 1904. The quotient refers to Binet's definition of IQ as (Mental Age) divided by (Chronological Age) or M.A./C.A.