Chapter 3: intoduction to statistics the Statistical Process
Mean, median and Mode for Grouped frequency distribution
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- Number of books Frequency
- Class Boundaries Frequency
- 3.3.2 MEASURES OF VARIATION Variance and Standard deviation
Mean, median and Mode for Grouped frequency distribution Mean,  where; =class midpoint
(Student must show the working ie. Find midpoint and  )
Median : - find cumulative frequency - find location of median class = 
- Median : 
Where;  = cumulative frequency until the point L (before median class)
 = frequency of the median class
c =class width of median class Mode : - find location of modal class : class with the largest frequency -Mode
where;  =lower boundary of the modal class
a = different between frequencies of modal class and the class before it. b= different between frequencies of modal class and the class after it. c =class width of median class Example: These numbers of books were read by each of the 28 students in a literature class. Find mean, median and mode.
Eighty randomly selected light bulbs were tested to determine their lifetimes (in hours). This frequency distribution was obtained. Find mean, median and mode.
3.3.2 MEASURES OF VARIATION Variance and Standard deviation (the spread of data set)
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=lower boundary of the median class