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30 December, 09:59

Yasmin has earned the following grades on her science tests: 97, 84, 88, and 87. What is the minimum

grade she must get on the last test in order to have an average of 90?

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  1. 30 December, 10:22
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    Step-by-step explanation:

    Average = Sum / total amount

    90 = (97+84+88+87+x) / 5

    90*5=356+x

    450-356=x

    x=94

    so she needs at least 94 marks in her last test for average 90
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