What is the z-score corresponding to the sample mean of these students’ scores?

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Scores on the quantitative portion of the GRE are approximately normally distributed with mean =150.8 and standard deviation =8.8A random sample of 5 students was selected to take the GRE. Their scores are: 160, 175, 163, 149, 153 What is the z-score corresponding to the sample mean of these students’ scores? (round your answer to 3 decimal places)

 

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