Cherry, the auditor, would like to find out the mean debtor's age for all debtors of ABC Pty Ltd, the audit client. She takes a random sample of five debtors' ages from ABC's accounts receivable subsidiary ledger as following,

Debtors' list	Age
Customer A	28
Customer B	31
Customer C	55
Customer D	14
Customer E	34

ABC company has trading terms of 2/30, n/45. Calculate and enter the upper bound of the 90% confidence interval for the mean debtor's age for all debtors of ABC in the answer block below.