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      Question

      The average marks of 30 students in a test is 64. Later,

      it is found that one student’s marks were wrongly entered as 68 instead of 86. What is the correct average marks of the class?
      A 58 Correct Answer Incorrect Answer
      B 45.5 Correct Answer Incorrect Answer
      C 77 Correct Answer Incorrect Answer
      D 64.6 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Original total = 30 × 64 = 1920 Correct total = 1920 − 68 + 86 = 1920 + 18 = 1938 New average = 1938 ÷ 30 = 64.6

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