The statistical mean can also be used to interpret statistical data. Some important properties make statistical mean very useful for measuring central tendency. Since Xi - X is the distance from a given number to the average. The numbers to the left of the mean are balanced by the numbers to the right of the mean.
Show the angles below using two pencils. Try to âseeâ the circle that is traced out in the air. This is a 1-degree angle! an obtuse angle; 127Â°. a right angle; 90Â°. How to measure an angle with a protractor 1  : Place the midpoint of the protractor on the VERTEX of the angle. 2  Line up one side of the angle with the zero line of the protractor (where you see the number 0). 3  Read the degrees where the other side crosses the number scale.
Coordinate Geometry. In another branch of mathematics called coordinate geometry, the points that define a line are located on the plane using their coordinates-two numbers that show where the point is positioned. For more on this, see Definition of a Line Segment (Coordinate Geometry) . If we know the coordinates of the two endpoints of a line segment, we can calculate the distance between them, and so find the length of the line segment. See Distance between two points (coordinate geometry).