Question

Roseanna did not pay last month's credit card bill in full. Her daily balances for her last billing cycle are listed. What was Roseanna's average daily balance to the nearest cent? (Hint: Find the average or mean of these numbers.)

For seven days she owed $456.11

For three days, she owed $1,077.00

For six days, she owed $900.08

For nine days, she owed $2,113.15

For five days, she owed $2,310.15

Answer 1

$228.54

Explanation:

Given : Roseanna did not pay last month's credit card bill in full. Her daily balances for her last billing cycle are listed.

To Find: What was Roseanna's average daily balance to the nearest cent?

Solution:

For seven days she owed $456.11

For three days, she owed $1,077.00

For six days, she owed $900.08

For nine days, she owed $2,113.15

For five days, she owed $2,310.15

Mean =
`\frac{\text{Sum of amount owned}}{\text{Total no. of days}}`

Mean =
`(456.11+1077+900.08+2113.15+2310.15)/(7+3+6+9+5)`

Mean =
`(6856.49)/(30)`

Mean =
`228.5496`

Hence Roseanna's average daily balance to the nearest cent is $228.54

Answer 2

Average daily balance = (456.11 + 1,077.00 + 900.08 + 2,113.15 + 2,310.15)/(7 + 3 + 6 + 9 + 5) = 6,856.49/30 = 228.55

Therefore, Roseanna's average daily balance = $228.55