Grouped Mean from Frequency Table

00:00 3 marks

The following frequency table shows the distribution of scores in a test:

| Class Interval | Frequency |
|—————-|———–|
| 10 – 20 | 4 |
| 20 – 30 | 6 |
| 30 – 40 | 5 |

Calculate an estimate for the mean score.

Hint Hint

Hint

To estimate the mean from grouped data, first find the midpoint of each class interval. Then, multiply each midpoint by its corresponding frequency. Sum these products and divide by the total frequency.

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Complete Answer

Approximately 25.67

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Grouped Mean from Frequency Table

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Grouped Mean from Frequency Table

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