Average with New Element

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The average (arithmetic mean) of a set of n numbers is 75. If adding the number 160 in the set raises the average to 80, what is the value of n?

Review: Average with New Element


Explanation

In this question, since the initial set of n numbers sums to . Therefore, when we add the number 160, we have a new total of , and numbers, so the average is









The correct answer is (B).


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