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Latisha is determined to do well in school this year. Her goal is to maintain at least an average (mean) in all of her courses.  

  1. Latisha started her history class with two scores on tests, and . Confirm that the mean of these two scores is . Show your work.

    To find an average, add the scores Latisha received together and divide by the number of scores she had.

  2. Latisha’s third score was . Use her scores from part (a) to figure out her mean now. Be sure to show your work.

    Remember you now need to add to the scores and divide by the number of scores you have now.