The Interquartile Range and Outliers. In the previous post, I introduced percentiles and quartiles and said that the Interquartile Range (IQR) is found by subtracting Q3 (the third quartile) minus Q1 (the first quartile).The IQR is significant because it tells us where the middle 50% of the numbers in the data set lie. Add the resulting number to Q3 to get an upper boundary for outliers. 2  Subtract the same resulting number (from #2) from Q1 to get a lower boundary for outliers. 3  If a number in the data set lies beyond either boundary, it is considered an outlier. 4  Q3 - Q1 = 88 - 80 = 8 (The IQR).
It was one of the biggest achievements in history. The earliest known use of this essential invention was a potter's wheel that was used at Ur in Mesopotamia as early as 3500 BC. The first use of the wheel for transportation was on Mesopotamian chariots in 3200 BC.long with the various other inventions Mesopotamia is well known for the unique and an important invention of the wheels. The wheels were invented by the Sumerians around 3500 BC.
Answer one: The wheel was thought to be invented by the Mesopotamians with a log because they realized they could take a log and place it under heavy objects and the logs wo â¦ uld roll. Answer Two: The oldest wheel was found 3000 BC in Holland before the early Mesopotamian civilizations.This was a spoked wheel so the history goes back much further. The current theory is it was invented in Ukraine, Balkans and southern Urals/ central asia.he date is before recorded history, the earliest wheel that's been  discovered is around 8000 years ago or 3700 BCE.