Question
The average of 30 numbers was initially calculated as
45. However, it was later found that one of the numbers had been incorrectly recorded as 83 instead of 8. What is the correct average of these 30 numbers after this correction?Solution
Total number will be decreased by (83-8) = 75 Average will decrease by = 75/30 = 2.5 Correct average = 45 – 2.5= 42.5
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