# Frequency Histogram

How to make and solve a frequency historam: 2 examples and their solutions.

## Example 1

### Example

### Solution

Draw a rectangular form like this.

The given frequency table shows

the intervals of the test scores

and their frequencies.

So write Test Scores

at the bottom of the form.

And write Frequency

on the left side of the form.

Write the intervals of the test scores

at the bottom of the form.

The frequencies are from 2 to 7.

So write 0 to 8

on the left side of the form.

And inside the rectangle,

lightly draw horizontal lines

that show each frequency.

The frequency of the interval 50-59 is 2.

So, for 50-59,

draw a vertical bar

whose height is 2.

The frequency of the interval 60-69 is 3.

So, for 60-69,

draw a vertical bar

whose height is 3.

Draw the bar right next to the previous bar

so that

there would be no space between the bars.

The frequency of the interval 70-79 is 7.

So, for 70-79,

draw a vertical bar

whose height is 7.

The frequency of the interval 80-89 is 6.

So, for 80-89,

draw a vertical bar

whose height is 6.

The frequency of the interval 90-99 is 2.

So, for 90-99,

draw a vertical bar

whose height is 2.

So this is the frequency histogram

of the given test scores.

## Example 2

### Example

### Solution

The students whose scores are less than 70

are these two bars.

So the number of the students is,

add the heights of the bars,

3 + 6.

3 + 6 = 9

So 9 is the answer.