Seth is studying for his fourth 100-point test in an economics class. What score must he earn on this test to have an average (mean) of 90 for the four tests? (1)Seth has the following scores on the first three tests: 77, 91, and 94. (2)The average of Seth’s scores on the first and third tests is 85.5.

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Seth is studying for his fourth 100-point test in an economics class. What score must he earn on this test to have an average (mean) of 90 for the four tests? (1)Seth has the following scores on the first three tests: 77, 91, and 94. (2)The average of Seth’s scores on the first and third tests is 85.5.