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Mathematics 12 Online
OpenStudy (anonymous):

The following table gives the scores of 47 students in a mathematics examination. Find the mean and the standard deviation of the given data. Hint: Assume that all scores within a group interval take the middle value of that group. (Round your answers to two decimal places.) Scores 90-99 80-89 70-79 60-69 50-59 Students 8 8 16 10 5

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