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OpenStudy (anonymous):
A juice shop owner wants to know the average amount of juice his staff puts into each glass. A sample of 50 glasses was found to have an average (mean) of 245 ml. If the known standard deviation of the amount of juice in each glass is 4 ml for the entire population, what is the margin of error of the sample mean? 1.13 ml 1.24 ml 1.35 ml 1.49 ml
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