how to find frequency in maths
Answers
Answer:
Year 8 Interactive Maths - Second Edition
Frequency and Frequency Tables
The frequency of a particular data value is the number of times the data value occurs.
For example, if four students have a score of 80 in mathematics, and then the score of 80 is said to have a frequency of 4. The frequency of a data value is often represented by f.
A frequency table is constructed by arranging collected data values in ascending order of magnitude with their corresponding frequencies.
Example
The marks awarded for an assignment set for a Year 8 class of 20 students were as follows:
6 7 5 7 7 8 7 6 9 7
4 10 6 8 8 9 5 6 4 8
We use the following steps to construct a frequency table:
Step 1:
Construct a table with three columns. Then in the first column, write down all of the data values in ascending order of magnitude.
Step 2:
To complete the second column, go through the list of data values and place one tally mark at the appropriate place in the second column for every data value. When the fifth tally is reached for a mark, draw a horizontal line through the first four tally marks as shown for 7 in the above frequency table. We continue this process until all data values in the list are tallied.
Step 3:
Count the number of tally marks for each data value and write it in the third column.
Answer:
If cumulative frequency is given - subtract c.f1 from c.f2. Repeat it again and again