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924 people phoned customer support for help with their internet connection. Technicians were not able to provide a solution for 420 of customers who

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924 people phoned customer support for help with their internet connection. Technicians were not able to provide a solution for 420 of customers who had called. If one customer is randomly selected from the number of people that phoned: a. Calculate the probability that it's a customer that technicians were not able to help, rounded to 3 significant digits as needed. b. Calculate the probability of the complementary event.

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