alleryFor grouped data, standard deviation is found by replacing each class by its:
AMid-point
BMax point
CMin point
DEnd point
Answer & Solution
Correct answer: A. Mid-point
1. A class covers a range of values, not a single one.
2. Each class is replaced by its mid-point.
3. The standard deviation is then calculated as usual.
_Source: syllabus Mathematics, Ch 15 'Statistics'_
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