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.
Mesopotamians also raised sheep, goats, and cows. Hoping for a plentiful crop, farmers worshipped Baal. Baal was a major Mesopotamian god of the sun and good crops. They also worshipped Ashnan, the Sumerian goddess of grain. Farming Tools The farmers of Mesopotamia were inventive. They made bronze hand tools, like hammers, sickles, axes, and hoes. Mesopotamians were probably the first to use the wheel. By 3000 BCE, they had invented the plow and plow seeder. Mesopotamians even wrote handbooks that told how and when to plant crops. They had a calendar based on the moon to aid farmers, too. Irrigation Techniques Mesopotamians traded their extra grain for stone, wood, metal products, and other goods. irrigation. They built canals, ditches and dikes to bring water to the land from the rivers. Because the rivers were higher than the surrounding plain, the water for irrigation flowed down into the fields.