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Question

Find the mean and standard deviation for each of the sample data sets. 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:

$\begin{matrix} \text{9} & \text{11} & \text{11} & \text{15}\\ \text{10} & \text{12} & \text{12} & \text{13}\\ \text{8} & \text{7} & \text{13} & \text{12}\\ \end{matrix}$

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