Given scores of 86, 88,78, what should the next score be in order to attain an average score of 83?

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<-- Enter Average

Given 3 scores of 86, 88, 78, what should be score number 4 in order to attain an average score of 83?

Setup Average Equation:

Average  =  Sum of our 3 numbers + unknown score of x
  Total Numbers

83  =  86 + 88 + 78 + x

Cross Multiply

86 + 88 + 78 + x = 83 x 4
x + 252 = 332

Subtract 252 from both sides of the equation to isolate x:

x + 252 - 252 = 332 - 252

What is the Answer?

x = 80

How does the Missing Average Calculator work?

Free Missing Average Calculator - Given a set of scores and an average, this calculates the next score necessary to attain that average
This calculator has 2 inputs.

What 1 formula is used for the Missing Average Calculator?

Average = (your Sum of all numbers + unknown score of x)/Total Numbers

For more math formulas, check out our Formula Dossier

What 3 concepts are covered in the Missing Average Calculator?

A number expressing the central value of a set
Sum of Values/n
missing average
A score or rank required to reach a certain average
an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount.

Example calculations for the Missing Average Calculator

  1. Given 2 scores of 75, 85, what should be score number 3 in order to attain an average score of 72?

Missing Average Calculator Video


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