The average of numbers is . When a new number, , is added, what is the new average?

Answer and explanation

Correct answer: C. 20

  1. Step 1: Find the initial total sum of the 4 numbers: .
  2. Step 2: Add the new value 36 to determine the new total sum: , with the count increasing to .
  3. Step 3: Divide the new sum by the new total count to compute the new average: .
Answer
20.

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