Missing Number Average Calculator: Find the Unknown Value

Calculate Your Missing Number

Enter all known numbers separated by commas (e.g., 70, 80, 65). Decimals are allowed.

Calculation Results:

The missing number required to achieve your target average is:

Our Missing Number Average Calculator helps you quickly determine an unknown value in a dataset to achieve a specific average. This tool is perfect for academic use, statistical analysis, or solving everyday math problems. Understand how averages work and find the missing piece of your data puzzle effortlessly.

Formula:

The formula to find the missing number (X) in a set, given the desired average (Avg) and other known numbers (n1, n2, ..., nk), is:

X = (Avg × Total Count) - Sum of Known Numbers

Where:

  • Avg: The target average for the complete set of numbers.
  • Total Count: The total number of items expected in the set, including the single missing number.
  • Sum of Known Numbers: The sum of all numbers you already have in the set.

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