Educator
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Curriculum
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Frequency refers to the number of times an event or a value occurs. A frequency table is a table that lists items and shows the number of times the items occur. We represent the frequency by the English alphabet âfâ.
For example, Alan has to put the footballs in two boxes. He starts dropping one football after the other into two boxes named A and B. Alan drops the balls randomly, and after dropping10 balls, he takes some rest and then again repeats the task with the remaining 10 balls.
The given tables show the pattern of how Alan drops the footballs in two boxes.
| Trial-1 | Trial-2 | ||
| Effort | Ball drops in box A or B | Effort | Ball drops in box A or B |
| 1 | A | 1 | B |
| 2 | B | 2 | B |
| 3 | A | 3 | A |
| 4 | A | 4 | A |
| 5 | A | 5 | A |
| 6 | A | 6 | A |
| 7 | B | 7 | B |
| 8 | A | 8 | A |
| 9 | B | 9 | B |
| 10 | A | 10 | A |
| Trials | Frequency of balls dropping in box A |
| Trials - 1 | 8 |
| Trials - 2 | 6 |
Such a table is known as the frequency table. We make the table by arranging collected data values and their corresponding frequencies. The purpose of constructing this table is to show the number of times a value occurs.
Tally marks help in counting the frequency of occurrence of something. It is used for record keeping.
| Trials | Tally marks | Frequency of balls dropping in box A (f) |
| Trials - 1 |  |
8 |
| Trials - 2 |  |
6 |
Step 1: Make three columns. The first column carries the data values in ascending order (from lesser to large values).
Step 2: The second column contains the number of times the data value occurs using tally marks. Count for every row in the table. Use tally marks for counting.
Step 3: Count the number of tally marks for each data value and write it in the third column.
For example, Rita maintains the record of the number of customers that visit her shop daily using the frequency table and tally marks.
| Interesting fact The frequency tables allow us to look at the entire data values in a more ordered and easy manner. Can you plot a frequency table by calculating the number of black cars, silver cars, motorbikes, bicycles in your locality? |
