A particular part has a spec of 1.785 inches (+ 0.005 inch). Which of the following parts should be "OK to ship"?

The specification for the part indicates that it should measure 1.785 inches, with a tolerance of plus or minus 0.005 inches. This means the acceptable range for this part is from 1.780 inches to 1.790 inches.

When examining the provided measurements, a measurement of 1.788 inches falls within the specified tolerance range (1.780 inches to 1.790 inches). Since it is above the nominal value of 1.785 inches but still within the acceptable limit of 1.790 inches, it meets the criteria for being considered "OK to ship."

In contrast, the other measurements do not fall within the acceptable range: 1.780 inches is at the lower limit, and while acceptable, it does not meet the criteria of being ‘above nominal’ like 1.788 does. Measurements of 1.784 inches, while close to the nominal specification, is still under the nominal value. However, 1.790 inches is technically at the upper limit and is also acceptable but is not the same as being above the nominal value.

Therefore, 1.788 inches is the measurement that distinctly confirms compliance with the upper tolerance limit, making it the most preferable option for shipping