Frequency Table

Frequency Table

How to make a frequency table from the given data and solve frequency table problems: examples and their solutions.

Example 1

For the given data below, make a frequency table. Use 5 intervals starting from 50-59.

Make a 3 column table.

In the Interval column,
write the 5 intervals:
from 50-59 to 90-99.

Name the next columns as Tally and Frequency.

Find the values that are in 50-59 interval:
56, 52.

While counting the values,
draw the tally mark 2
in the Tally column.

And write 2 (the number of the data)
in the Frequency column.

Find the values that are in 60-69 interval:
60, 69, 67.

While counting the values,
draw the tally mark 3
in the Tally column.

And write 3
in the Frequency column.

Find the values that are in 70-79 interval:
74, 78, 77, 75, 70, 74, 74.

While counting the values,
draw the tally marks 5 and 2
in the Tally column.

And write 7
in the Frequency column.

Find the values that are in 80-89 interval:
81, 81, 85, 84, 80, 88.

While counting the values,
draw the tally marks 5 and 1
in the Tally column.

And write 6
in the Frequency column.

Find the values that are in 90-99 interval:
91, 97.

While counting the values,
draw the tally mark 2
in the Tally column.

And write 2
in the Frequency column.

So this is the frequency table.

Example 2

For the given frequency table, find the number of data that is less than 80.

The intervals that are less than 80 are
50-59, 60-69, and 70-79.

And the frequencies of the intervals are
2, 3, and 7.

So the number of the values
that is less than 80 is
2 + 3 + 7.

So 12 is the answer.