Roading scores. The grade-level reading scores from a reading test given to a random sample of 12 students in an urban high school graduating class are: 7 11 13 13 12 8 14 11 15 15 a. Find the mean of the reading scores. 11.25 (Type an integer or a decimal. Round to two decimal places.) b. Find standard deviation of the reading scores. (Type an integer or a decimal. Round to two decimal places.)

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