The following are the heights (in centimeters) of 40 students in a class,Tally corresponding number of scores in each interval then summarize the results or sum up the tallies under the frequency column.
| Height (cm) | Tally | Frequency |
125-130 | | |
131-136 | | |
137-142 | | |
149-154 | | |
155-160 | | |
161-166 | | |
167-172 | | |
Answers
Organization of the Data
Now that you have your data, what can be done with them? These data are raw data. We have to organise it in some meaningful way to take out the information. Consider the example of a collection of data of your favourite sport. From this raw data, you can count the number of the people who like a particular sport.
Tally Marks
Tally marks are the representation of the data in the form of vertical lines. We put one vertical line (|) for each of the four counts. A diagonal line (\) is put for the fifth count. These marks are tally marks.
Tally marks for Number 4 is ||||
Number 5 is represented as Frequency Distribution
The representation of 6 as Frequency Distribution and so on.
Frequency Distribution
The representation of the various observations and tally marks in a form of table is the frequency distribution. The frequency is the number of the times an observation occurs. It is the number of repetitions. Consider in a class of 30 students, 5 like badminton. 10 students like cricket, 3 like tennis, 4 like football, 7 like volleyball and 1 likes hockey.
Representation of this data:
Tally
This table is the frequency distribution table or the frequency table. Each item of this table, badminton, cricket etc. is an observation. The number of the students is the frequency.
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