An operator wants to determine the standard deviation for a machine relative to its ability to produce windshield wipers conforming within their specifications. To do this, she wants to create a p-chart. Over a month's time, she tests 75 units every day and records the number of manufacturing defects. The average proportion of non-conforming windshield wipers is found to be 0.003. What is the standard deviation of this sample? Enter your response with four decimal points