Aspirin is packed in 120 tab bottles with weight normally distributed with mean 600g and standard deviation 6g.  We want to figure out what is the probabilty that a bottle of aspirin randomly picked from the production batch will weigh 593g or less. Do we have to calculate one z-score or two z-scores?  The negative z-score is The positive z-score is

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Aspirin is packed in 120 tab bottles with weight normally distributed with mean 600g and standard deviation 6g. 

We want to figure out what is the probabilty that a bottle of aspirin randomly picked from the production batch will weigh 593g or less.

Do we have to calculate one z-score or two z-scores? 

The negative z-score is

The positive z-score is

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