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Mathematics, 16.06.2020 10:57 kirinaallison

Amber's mean mark on five tests is 80. Her marks on four of these tests are 68, 81, 74 and 89.
Work out her mark on the fifth test.

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Amber's mean mark on five tests is 80. Her marks on four of these tests are 68, 81, 74 and 89.
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