what is the meaning of iqr in math
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,[1][2] IQR = Q3 −  Q1. In other words, the IQR is the first quartile subtracted from the third quartile; these quartiles can be clearly seen on a box plot on the data. It is a trimmed estimator, defined as the 25% trimmed range, and is the most significant basic robust measure of scale.
SPQR SPQR is an initialism of a phrase in Latin: Senātus Populusque Rōmānus ("The Roman Senate and People", or more freely as "The Senate and People of Rome"; Classical Latin: [sɛˈnaː.tʊs pɔpʊˈlʊs.kᶣɛ roːˈmaː.nʊs]), referring to the government of the ancient Roman Republic, and used as an official emblem of the modern-day comune (municipality) of Rome. It appears on Roman currency, at the end of documents made public by inscription in stone or metal, and in dedications of monuments and public works.