2-Frequency Distribution (OR Series with Class Intervals); Relative freq/Size of CI/mid value of CI
Learning Outcomes:- Through this module, you will gain understanding on:- 1. Frequency series (With frequencies) 2.a Frequency Array (OR Discrete Series) 2.b Frequency Distribution (OR Series with Class Intervals) 2. Meaning of some important terms - Frequency, Class frequency, Tally Bars 3. Frequency Array (OR Discrete Series) - example, drawbacks 4. Frequency Distribution - features 5. Relative frequency 6. Diff b/w Frequency Distribution AND Frequency Array 7. Size of Class Interval 8. important terms - class, class interval, magnitude of CI, mid value of CI |
Reference list entries:
1. https://www.enchantedlearning.com/math/tally/tallytable2.GIF
2. https://byjus.com/maths/tally-marks/
2. Frequency series (With frequencies)
2.a Frequency Array (OR Discrete Series)
2.b Frequency Distribution (OR Series with Class Intervals)
Meaning of some important terms -
Frequency
● Number of times an item occurs or repeat itself in series
● Eg. 4 students have secured 10 marks
Frequency of 10 is 4
Class frequency
● Number of times an item repeats itself corresponding to a class interval (range of value)
● Eg. There are four students securing marks between 10-15
4 Is the frequency corresponding to the class interval 10-15
Tally Bars
● Every time an item occurs, a Tally Bar (|) is marked against it
● Two Tally Bars would mean that the concerned item has occurred twice in the series
● After every four Tallies, the fifth Tally will cross out all the previous four tallies, thus, making a group of five
● This method of marking and counting is known as four and cross method
2.a Frequency Array (OR Discrete Series)
● Exact measurements of data items are clearly shown
● No class intervals
● Items of series are arranged in ascending or descending order
● Frequencies are noted in front of each item
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