The average of numbers is . When a new number, , is added, what is the new average?
Answer and explanation
Correct answer: A. 34
- Step 1: Calculate the initial total sum of the numbers: .
- Step 2: Add the new value to obtain the updated sum: .
- Step 3: Divide by the new total count of numbers: .
Answer
34.
Why not the others: 31 is the original average; 46 is the added number; 77/2 is the simple average of 31 and 46 (); 36 divides by 4 instead of 5.
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