Correct Answer: Option E

Explanation

Given the class intervals: \(3 - 7\), \(8 - 12\), \(13 - 17\), and \(18 - 22\):

The class interval is \(4\):

\(7 - 3 = 4 \quad \text{(True)}\)
Class boundaries are \(2.5, 7.5, 12.5, 18.5, 22.5\):

- Correct boundaries: \(2.5, 7.5, 12.5, 17.5, 22.5\)  False.
Mid-marks are \(5, 10, 15, 20\):

\(\text{Mid-mark} = \frac{\text{Lower} + \text{Upper}}{2}\)

- \(3 - 7: 5\)
- \(8 - 12: 10\)
- \(13 - 17: 15\)
- \(18 - 22: 20\) True.

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