MathDB
Average of Ten Numbers

Source:

February 11, 2009

Problem Statement

If each number in a set of ten numbers is increased by 20 20, the arithmetic mean (average) of the original ten numbers: <spanclass=′latex−bold′>(A)</span> remains the same<spanclass=′latex−bold′>(B)</span> is increased by 20<spanclass=′latex−bold′>(C)</span> is increased by 200<spanclass=′latex−bold′>(D)</span> is increased by 10<spanclass=′latex−bold′>(E)</span> is increased by 2 <span class='latex-bold'>(A)</span>\ \text{remains the same} \qquad <span class='latex-bold'>(B)</span>\ \text{is increased by 20} \qquad <span class='latex-bold'>(C)</span>\ \text{is increased by 200} \\ <span class='latex-bold'>(D)</span>\ \text{is increased by 10} \qquad <span class='latex-bold'>(E)</span>\ \text{is increased by 2}
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