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)
111 Starting balance 122312231223
101010 Deposit 615615615
151515 Withdrawal -63−63minus, 63
222222 Withdrawal -120−120minus, 120
There are 303030 days in June.
What is the average daily balance of Elliott's account for the month of June?