We will discuss here how to use Tally marks.
To count the number of times a value of the variable appears in a collection of data, we use tally mark ( / ). Thus tally mark represents frequency.
Observe the tally marks and the corresponding frequencies:
Example:
(i) Write the tally marks for a frequency of 22.
(ii) What is the frequency corresponding to the tally marks
Solution:
(i)
(ii) 16 (Since, 5 + 5 + 5 + 1 = 16)
Problems on Tally Marks
1. The weights (in kg) of the teachers of s school are recorded as shown below.
60, 65, 63, 70, 65, 62, 65, 63, 64, 60, 68, 58, 62, 65, 63, 65, 64, 60, 62, 63.
If the collection of data be grouped into the class intervals 56  59, 59  62, 62  65, 65  68, 68 71 then write the tally marks for the frequency of variate 65 and the class interval 62  65.
Answer:
(Since only 62, 62, 62, 63, 63, 63, 63, 64, 64 fall in this class)
2. The weights (in kg) of the teachers of s school are recorded as shown below.
60, 65, 63, 70, 65, 62, 65, 63, 64, 60, 68, 58, 62, 65, 63, 65, 64, 60, 62, 63.
If the collection of data be grouped into the class intervals 56  59, 60  63, 64  67, 68  71 then write the tally marks for the frequency of the class 60  63.
Answer:
(Since only 60, 60, 60, 62, 62, 62, 63, 63, 63, 63 fall into this class)
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