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random variables - expected value of time taken to perform a service

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Hello everyone,

My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and reading wikipedia, so please bear with me if I do not express myself correctly or use the most appropriate words.

I work in a service company, a hygiene B2B company; we have a number of services (such as changing the soap or washing a shower; for the case say A, B, C, D and E).

Every time one of our technicians visits a customer, he may perform one or more of them a number of times, e.g. John Doe may go to Restaurant Food and do 2A + 3C + 1D

They all carry a PDA, so I can timestamp when they go in, and when they get out, so I know the total time used to perform all the services; in the example below 2A + 3C + 1D = 320 seconds

With 380 technicians, visiting 18 customers each day, I get 6840 of these 'equations' every day. A huge sample.

Is it possible for me to somehow calculate the expected value of each service type, so I can predict how much time the technicians will take in a customer, given the services he needs to perform?

I really appreciate any help you can provide, even if just pointing me to a document or a wiki I should read or what should I google for.

All the best,
Alex

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