the average of 15 numbers is 20 if one number is excluded the average become 9 find the excluded number
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Answer: 74
Step-by-step explanation:
Average of 15 numbers = 20
Sum of 15 numbers = 15×20 = 300
When 1 no is excluded
Average of 14 numbers = 9
Sum of 14 numbers = 14×9 = 126
Excluded number = 300 - 126 = 74
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