Free practice on Data Management for Class 6, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
Bar chart: separate categories. Pie chart: parts of a whole. Line chart: change over time. Histogram: numeric ranges. Pick the chart that answers your question best.
| Chart | Best for |
|---|---|
| Bar chart | Compare categories |
| Pie chart | Show shares of a whole |
| Line chart | Change over time |
| Histogram | Distribution of values |
| Pictogram | Visual counts using icons |
Mean = total ÷ count (average). Median = middle value when sorted. Mode = most common value. For 2, 3, 5, 5, 7: mean = 22 ÷ 5 = 4.4; median = 5; mode = 5.
| Measure | How to find |
|---|---|
| Mean | Total ÷ count |
| Median | Middle value (sort first) |
| Mode | Most common value |
| Range | Highest − lowest |
A frequency table groups data by value or range. For grades in a class, count how many pupils in each grade band. This becomes the histogram or bar chart.
| Grade | Frequency |
|---|---|
| Excellent (≥18) | 3 |
| Very good (16-17) | 7 |
| Good (14-15) | 10 |
| Pass (10-13) | 8 |
| Below (< 10) | 2 |
Find the mean of 5, 10, 15, 20 and 10.
Write your answer, then check below.
Answer: 12
(5+10+15+20+10) ÷ 5 = 60 ÷ 5 = 12.
The number of times a value appears in data is called its:
Answer: B. frequency
Arrange in descending order: 4506, 4650, 4056
Answer: B. 4650, 4506, 4056
In a tally count, IIII with a line across means 5. How much is 3 such groups plus II?
Write your answer, then check below.
Answer: 17
3 × 5 = 15, plus 2 = 17.
Which chart shows data using rectangular bars?
Answer: B. bar chart
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