Marcus took 8 tests. here are his marks in these tests. 10,6,17,15,7,6,14,13 the mean is 11. Marcus took another test. the mean for all 9 tests is the same as the mean for the first 8 tests. find Marcus' mark in the 9th test.

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Marcus took 8 tests. here are his marks in these tests. 10,6,17,15,7,6,14,13 the mean is 11. Marcus took another test. the mean for all 9 tests is the same as the mean for the first 8 tests. find Marcus' mark in the 9th test.

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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It has to be equal to the old mean, so 11. If it would not be so it would change the new mean.
okay thanks

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