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    Mean Score

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    Q4) In a statistics course, there are five examinations. A student receives scores of 83, 85, 80, and 81 on the first four exams. What score must the student get on the fifth exam in order to have a mean average of 80 for the five exams? Explain your answer.

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    Solution Preview

    Let x be the required score, since the average for the five exams is 80,
    Thus (83+85+80+81+x)/5 = 80
    83+85+80+81+x = 80*5 =400
    X = 400-(83+85+50+81)=71
    The ...

    Solution Summary

    The solution provides step by step method for the calculation of mean score based on a restriction . Formula for the calculation and Interpretations of the results are also included.