Question: An operator wants to determine the standard deviation for a machine she operates. To do this, she wants to create a p -chart. Over a

An operator wants to determine the standard deviation for a machine she operates. To do this, she wants to create a p-chart. Over a month's time, she collects 30 samples of 75 observations each and records the number of errors. The average proportion defective is found to be 0.024. Which of the following is the standard deviation ( ) of the machine?

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