Hello viewers!
My name is Sunday, and in today’s tutorial on AllCBTs, we’re solving one of the most frequently asked questions in NABTEB Economics 2025. This is an essay-style question based on data analysis — so follow along carefully step by step.
You can watch the full class in the video below:
Problem Background
We’re provided with data showing the number of bad oranges (x) found in baskets from a farm. Based on this dataset, we’re required to:
- Create a frequency table
- Generate the cumulative frequency distribution
- Construct a histogram
- Draw a frequency polygon
Let’s go through these one by one.
Step 1: Frequency Table
Frequency Distribution
| Number of Bad Oranges (x) | Frequency (f) |
|---|---|
| 0 | 6 |
| 1 | 8 |
| 2 | 6 |
This table shows how many times each category of bad oranges appeared in the sample.
How We Calculated It
From the dataset:
- Zero appears 6 times
- One appears 8 times
- Two appears 6 times
This gives us the frequency for each number of bad oranges found in the baskets.
This answers Question A1 — forming the frequency table from raw data.
Step 2: Cumulative Frequency Distribution
We now add up the frequencies sequentially:
| x | Frequency (f) | Cumulative Frequency (CF) |
|---|---|---|
| 0 | 6 | 6 |
| 1 | 8 | 14 |
| 2 | 6 | 20 |
This helps show how the total number of observations accumulates as x increases.
Step 3: Histogram & Frequency Polygon
To visualize the data:
- Histogram: Draw bars to represent the frequency for each x-value.
- Frequency Polygon: Plot points above the midpoints of the bars, then connect them with straight lines.
These tools help communicate data trends effectively in a visual format.
Watch more educational videos and past questions: https://youtube.com/@allcbts
Why This Is Crucial for NABTEB Economics
This type of question:
- Tests your ability to handle statistical data
- Prepares you for more complex economic data interpretation
- Helps in answering real-world economic problems using numbers and visuals
Data interpretation is a major skill in economics and is regularly tested in NABTEB exams.
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Description:
Learn how to solve NABTEB Economics 2025 data questions step by step: frequency tables, cumulative frequency, histograms, and frequency polygons explained in simple terms.
Keywords:
NABTEB Economics 2025, how to draw frequency polygon, frequency table example, cumulative frequency explanation, histogram in economics, NABTEB past questions, economic data analysis