Question
A batch of 28 students had their average science score
recorded as 66. Later it was identified that 70 was wrongly recorded as 60, and 65 was noted instead of 68. What is the correct average?Solution
ATQ,
Correct average
= {(28 × 66) – 60 + 70 – 65 + 68} / 28
= {1848 – 60 + 70 – 65 + 68} / 28
= 1848 – 60 = 1788 + 70 = 1858 – 65 = 1793 + 68 = 1861
Correct average = 1861 / 28 = 66.46
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