1
Grouped Data Basics
Identify class intervals, limits, frequency and class width
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Statistics
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2
Grouped Data Basics
Calculate midpoints for grouped data intervals
3
Mean
Use class marks and frequencies to find grouped mean
4
Mean
Use deviations from assumed mean to simplify mean calculation
5
Mean
Use coded deviations when class widths are equal
6
Mean
Select direct, assumed mean or step-deviation based on data
7
Median
Prepare less-than cumulative frequency table
8
Median
Locate the class containing N/2 observation
9
Median
Apply the grouped median formula correctly
10
Mode
Find the class with highest frequency while avoiding bimodal cases
11
Mode
Apply the grouped mode formula correctly
12
Comparison
Interpret which measure best represents a given data set
13
Applications
Use statistics in marks, heights, wages and survey contexts
14
Error Analysis
Correct cumulative frequency, class width and formula substitution errors
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