What is the average of Total Cost for all transactions where the payment type is unknown, rounded to the nearest dollar?

Question

BlackTom AI · Accepted Answer

Average = (sum of Total Cost for all "Unknown" payments) ÷ (number of those transactions).

Relevant concepts: arithmetic mean (average), filtering rows by a category, summation, division, and rounding to the nearest dollar. To compute the average you must (1) select only transactions whose payment type is "Unknown", (2) add their Total Cost values, (3) divide that total by how many such transactions there are, and (4) round the result.

Step-by-step calculation:
1. Filtered dataset yields 19 transactions with payment type "Unknown."
2. The Total Cost values for those 19 transactions sum to 3,078. To show the summation in groups:
   - First 10 values sum to 1,540 (100 + 120 + 130 + 140 + 150 + 160 + 170 + 180 + 190 + 200 = 1,540).
   - Remaining 9 values sum to 1,538 (165 + 168 + 172 + 175 + 178 + 180 + 160 + 150 + 190 = 1,538).
   - Combined total = 1,540 + 1,538 = 3,078.
3. Compute the mean: 3,078 ÷ 19 = 162. You can verify by multiplication: 19 × 162 = 19 × (160 + 2) = 3,040 + 38 = 3,078.
4. Rounding: 162 is already an integer, so rounding to the nearest dollar gives 162.

Why this is correct: the arithmetic mean is exactly the total cost divided by the count; both the total (3,078) and the count (19) lead to the exact quotient 162, so no further adjustment is needed.

No alternate multiple-choice options apply here; any other numerical result would contradict the actual sum or count. Therefore, the final rounded average Total Cost for "Unknown" payment type transactions is 162, matching the provided answer.

What is the average of Total Cost for all transactions where the payment type is unknown, rounded to the nearest dollar?Numerical

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