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The mean of 10 numbers is 24. Later it was found that one number had been read as 36 instead of its correct value 63. What is the corrected mean?

Competition practiceData & Probability
  • A24.7
  • B26.7
  • C27.6
  • D25.7

Step-by-Step Solution

Incorrect total = . The correct total is 240 − 36 + 63 = 267, so the corrected mean is 267 ÷ 10 = 26.7.
Answer: B) 26.7

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