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The average daily balance is the mean of the balance in an account at the end of each day in a month.
The following table gives the dates and amounts of the transactions in Elliott's account in June.
Day of June
Transaction type
Transaction amount (in dollars)
1223
Starting balance
Deposit
615
15
Withdrawal
-63
-120
22
Withdrawal
There are 30 days in June.
What is the average daily balance of Elliott's account for the month of June?