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Question 493:

On a police sergeants exam, the historical mean scored was 80 with a standard deviation of 20. Four offiers scored 195,175,191, and 189 respectively. Irregularity.The officers were alleged cronies of the police chief because of their scores. Convert these four offiers socres to a standardized Z-value. Do you think there is sufficient reason to question these four exam scores; and if so how did you make this determination.

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