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The grouped mean came to 62 while the exact mean was 59.3 because of the:
AWrong frequencies
BMid-point assumption
CRounding of marks
DMissing students
Answer & Solution
Correct answer: B. Mid-point assumption
1. Grouping assumes each class is centred at its mid-point.
2. That makes the grouped mean approximate.
3. 59.3 is exact and 62 approximate.
_Source: NCERT Class 10 Mathematics, Chapter 14, Statistics._
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