What is the probability of failure before the next maintenance window?

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Mr. Marsh and his brother-in-law Hyman Golden originally ran a Brooklyn-based window-washing and office-maintenance business.

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To make a maintenance appointment, does a client need to wait at home for a 6-hour appointment window, have the technician show up late, and track mud through her freshly-cleaned carpet, no wonder she called to argue about the bill.

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