Understanding Histograms
What does a histogram show?
The distribution of data in intervals (ranges).
If a bar reaches up to 5 on the y-axis, what does that mean?
5 values fall within that interval.
What is a “bin” or “interval” in a histogram?
A range of values (e.g., 10–20, 21–30).
Which graph is better for showing ages of 100 people: histogram or pie chart?
Histogram.
A histogram shows student test scores. What could the school learn?
Which score ranges are most common.
What are the bars in a histogram used to represent?
The frequency of data within each interval.
What is the most common interval in this histogram?
The interval with the tallest bar.
What is “frequency” in a histogram?
How often a value occurs within a range.
Why use a histogram instead of a line graph?
Line graphs show change over time; histograms show distribution.
A company uses a histogram for delivery times. Why?
To see which time range is most frequent.
Are the bars in a histogram touching or spaced?
Touching (because the data is continuous).
Which interval has no values?
Any bar with a height of 0.
What does the height of a bar represent?
The number of data points in that interval.
In what way is a histogram more useful than a bar graph for large data?
It groups data into intervals, showing patterns better.
A histogram shows most customers visit between 2–4 PM. What should a store do?
Schedule more staff during peak hours.
What is the difference between a histogram and a bar graph?
Histograms show intervals; bar graphs show categories.
How many total values are shown in the histogram?
Add all the frequencies together.
What does the x-axis show in a histogram?
The data intervals (or bins).
Can a histogram show more than one data set?
No, it's usually used for one data set.
How can a doctor use a histogram of patient ages?
To understand the age group most commonly seen.
What kind of data is best shown with a histogram?
Numerical data grouped into ranges.
If two intervals are the same height, what does that mean?
They have the same number of values.
What does the y-axis show in a histogram?
The frequency of the data in each interval.
Why shouldn’t histogram bars have spaces between them?
Because the data is continuous.
Why would a fitness coach use a histogram for client weights?
To track weight distribution and progress.