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People commuting from Cambridge are typically late for work 5 days a month (λ = 5)....

People commuting from Cambridge are typically late for work 5 days a month (λ = 5). The city changes the timing of one key traffic light encountered by 75% of Cambridge commuters. This reduces the number of times they are expected to be late for work to only 3 days a month. The remaining 25%, who don’t go through that traffic light, are still expected to be late 5 days a month, just as as they were before. Determine the expected number of tines someone from Cambridge will be late for work the month after they change the timing of the traffic light.

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