Specifications for a part for a 3-D printer state that the part should weigh between 24.3 and 25.3 ounces. The process that produces the parts has a mean of 24.8 ounces and a standard deviation of .23 ounce. The distribution of output is normal. Use Table-A.

a.What percentage of parts will not meet the weight specs? (Round your "z" value and final answer to 2 decimal places.)

b.Within what values will 99.74 percent of the sample means of this process fall if samples of n = 6 are taken and the process is in control (random)? (Round your answers to 2 decimal places.)

*Please explain where all figures came from for this part. How is Z computed? I've seen other examples but they don't explain each step, just give numbers from no where.*

c. Using the control limits from part b, would the following sample means be in control? 24.52, 24.53, 24.44, 24.51, 24.41, 24.39

multiple choice

This process is in control.

This process is not in control.