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Marks of 40 students: less than 10 – 4, less than 20 – 10, less than 30 – 22, less than 40 – 30, less than 50 – 40. Find the mean mark.

Competition practiceStatistics
  • A25
  • B28.5
  • C30.2
  • D27.5

Step-by-Step Solution

Class frequencies: 4, 6, 12, 8, 10. ; mean .
Answer: B) 28.5

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