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Use Graphical Techniques Theory Questions

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=mx + c, what does the m and c represent?
11.  In the line equation y=mx + c which two values represent the coordinates of a point?
12.  When writing down the coordinates of a point, which movement is represented first, horizontal or vertical?
13.  What is the difference between a bar graph and a histogram?
14.  Define x-intercept.
15.  Define gradient.
16.  Define minimum point.
17.  If the mean of 4 numbers is 20, what would be the new mean if the number 10 is added?
18.  If the variance of a data set is 144, calculate the standard deviation.
19.  If the smallest value in a data set is 20 and the largest value is 36, calculate the range.
20.  If the cumulative frequency of a data set is 10, which term/place contains the median?
21.  If a plumber fills three tanks in an average of two and a half hours, calculate the time taken to fill the last tank if the first two were filled in a total of three hours?


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