Ina class, the average score of thirty students on a test is 69. Later on it was found that the score of one student was wrongly read as 88 instead of 58. The actual average score is:
Answer & explanation
Correct answer: option 4
Sum of score of thirty students = 30 x 69 = 2070
Correct sum = 2070 - 88 + 58 = 2040
Actual average = \(\frac{2040}{30}\) = 68