did you find out if this was the correct answer? I have the same question and i did not know what they meant when they requested the aggregate RDF.
If you are supposed to compute the aggregate RDF, does that mean compute the RDF for all the components and then add them up to get the aggregate RDF? I have searched my course book and the internet to see how you compute the aggregate RDF, with no luck. The problem says to assume a series combination of elements for your calculation. So I thought you would multiply each reliability in the series and then subtract that number from 1 to get the RDF. Then i read that "aggregate" means the "sum of," so I thought I would compute the RDF for all the elements, add them together and then subtract that number from 1 to get the aggregate RDF.
Below is the problem:
Using the information from Table 1, what is the aggregate RDF for a vehicle configuration using 3 fuel pods? Assume a 'series' combination of the launch elements shown for your calculation. The reliability of the 4 elements are: .991, .995, .993, and .997 for each fuel pod. Since the problem says it uses 3 fuel pods, you would have to compute the .997 for the fuel pod three times for a total of 6 elements in the problem. Am I on the right track? The RDF formula is: RDF=1-reliability. I got 0.03 as the RDF. Is that correct? Please let me know what you think.