The score which is needed on the fourth test so that as average score of 90 is earned as required in the task content is; 93.
According to the task content, it follows that the score needed so that an average score of 90 is earned on all four tests is to be determined.
Since, The average is the ratio of the sum of all scores to the number of scores; we have;
90 = (88 + 92 + 87 + x)/4
Multiply both sides by 4 so that we have;
360 = 88 + 92 +87 + x
Isolate x on one side of the equation;
x = 360 -88 -92 - 87
x = 93.
Ultimately, The score which is needed on the fourth test so that as average score of 90 is earned as required in the task content is; 93.
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