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Question

A bank teller can serve up to $5$ customers per minute. The number of customers arriving each minute for $10$ minutes is: $4$ , $6$ , $5$ , $7$ , $3$ , $8$ , $5$ , $2$ , $6$ , $7$ . At the start, no customers are waiting. What is the number of customers waiting at the end of minute $10$ ?

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A bank teller can serve up to 55 customers per minute. The number of customers arriving each minute for 1010 minutes is: 44, 66, 55, 77, 33, 88, 55, 22, 66, 77. At the start, no customers are waiting. What is the number of customers waiting at the end of minute 1010?

A bank teller can serve up to $5$ customers per minute. The number of customers arriving each minute for $10$ minutes is: $4$ , $6$ , $5$ , $7$ , $3$ , $8$ , $5$ , $2$ , $6$ , $7$ . At the start, no customers are waiting. What is the number of customers waiting at the end of minute $10$ ?