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.
Study these two figures. Only the pair on the right is considered to be adjacent, angles c and d. Adjacent angles must share a common side and a common vertex, and they must not overlap each other. Vertical angles are pairs of angles formed by two intersecting lines. Vertical angles are not adjacent anglesâthey are opposite each other. In this diagram, angles a and c are vertical angles, and angles b and d are vertical angles. Vertical angles are congruent.