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MIT 18.06 Linear Algebra, Spring 2010
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OpenStudy (anonymous):
write and solve an equation to find the value of the varriable: 102, 126, 118, 120 x: mean=120
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OpenStudy (anonymous):
So, the main point is that the mean is the sum of all members of the set, divided by 5 (the number of members of the set). You are told that this value is 120. Therefore, the sum of all values is 600, or 120 x 5. You can write the equation that the sum of all those values, including x, equals 600, and simplify from there.
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