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The Shelby County Emergency 911 System usually receives about 100 calls each hour. One day the system was down for 80 minutes. All incoming calls...

The Shelby County Emergency 911 System usually receives about 100 calls each hour. One day the system was down for 80 minutes. All incoming calls received a busy signal during that time.
How many calls would you predict were not received by the Emergency 911 system while it was not operating? Justify your answer.
(This actually happened in Memphis.)

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