Aspirin is packed in 120 tab bottles with weight normally distributed with mean 600g and standard deviation 6g. Rejected bottles are those whose weight differs from the mean weight by 15g or more....

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

Rejected bottles are those whose weight differs from the mean weight by 15g or more.  That is, rejected bottles have weight either too small or too large.  We want to find out how many bottles will be rejected from a daily production of 5000 bottles.

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

2. The negative z-score is

3. The positive z-score is

4.How many bottles, of the 5000, do we anticipate to have to reject?