Three math tests have been written this term. The mean mark is 74%. What must the next mark need to be to raise the mean to 78%?
Five tests have been written for a mean of 82%. What must the next mark need to be to raise the mean to 85%?
The temperatures of 4 days have been recorded. The mean temperature is 21 degrees Celsius. What must the next temperature be to raise the mean to 22 degrees?
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