Question
Download Solution PDFThe average of 8 numbers is 18. If one of the numbers is excluded, the average becomes 20. Find the excluded number.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven :
Average of 8 numbers is 18.
One of the numbers is excluded, the average becomes 20.
Formula Used :
Average = Sum of all observations/Number of observations
Calculation :
Sum of 8 numbers = 18 × 8 = 144
Sum of 7 numbers = 20 × 7 = 140
Excluded number = 144 - 140 = 4
∴ The correct answer is 4.
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