Final answer:
The question appears to pertain to calculating statistics like average or median hourly earnings, suitable for high school mathematics, but more information is needed to provide a precise answer.
Step-by-step explanation:
The student's question involves interpreting and analyzing hourly earnings for a sample of railroad equipment manufacturers. While there is not enough information to provide a detailed statistical analysis, the given values could be examined to calculate measures like the average, median, range, and standard deviation of hourly earnings. Using technology, such as a spreadsheet or statistical software, these calculations would typically involve entering the data points into the program and using its functions to compute the desired statistics.
However, we cannot perform these calculations as the provided information (the addition of parts A through D and the example data regarding labor cost and cost of technology) does not constitute a complete data set or a clear question. For accurate assistance, additional data or clarification of the question would be necessary.