The grades for 30 students on the most recent exam are given in the data table below: 90 60 60 80 90 60 60 80 90 90 80 80 70 80 60 60 80 70 90 90 70 80 Create a frequency distribution table to help you organize the data, and then calculate the following: Round your answers to 2 decimal places as needed What is the median score for the exam? Median = What is the mean score for the exam? X = What is the standard deviation for the exam? S = What is the interval that would contain all of the scores that lie within one standard deviation of the mean? 88888 90 60 60 70 90 188 818 70 I607元 7元

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