Use Graphical Techniques Theory Questions 1. What is central tendency? 2. State two (2) ways of finding central tendency. 3. What is dispersion? 4. State two (2) ways of finding dispersion. 5. State the formula for calculating probability. 6. State, using whole numbers, the minimum and maximum value for probability. 7. If the probability of event A is 0.4 and the probability of event B is 0.2, calculate the probability of: a. event A or event B happening. b. event A and event B happening. c. event A not happening( as a percentage). 8. What happens to the standard deviation of a control graph if sigma 2 limits are used? 9. Which values on a control graph would indicate that something may be wrong? 10. In the equation of a line which states that y =m x + c , what does the m and c represent? 11. In the line equation y =m x + c which two values represent the coordinates of a point