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Posted by on Thursday, June 23, 2011 at 12:26pm.

Jacob has a mean score of 78 after his first four math tests. He wants to make a B, or an average of 80, in math. What does he need to score on the fifth test to have a mean score of 80?

  • algebra - , Thursday, June 23, 2011 at 12:30pm

    80 * 5 = 400

    78 * 4 = 312

    400 - 312 = 88

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