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.
A Grinding Wheel is basically a precision tool composed of abrasive grains held together by a. bonding material or ' bond'. The abrasive grains provide the wheel with its cutting points , which. in turn help in cutting the material to the required dimensional accuracy or help impart a fine. surface finish.