In this simple case, customers are only described by age and average balance.
在这个简单的案例中，客户只以年龄和平均余额来描述。
What is the average balance and transaction count this month for customers by bank branch?
按照银行支行，本月客户的平均余额和交易数是多少？
Choosing the right account depends on working out your likely average balance.
只有计算出自己可能的平均结余，才能选择合适的账户。
Choosing the right account depends on working out your likely average balance.
只有计算出自己可能的平均结余，才能选择合适的账户。
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