Statistics

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Question need help solving:

Andre is the head waiter at a famous gourmet restaurant in San Francisco. The IRS is doing an audit on his tax return this year. In particular, the IRS wants to know the average amount Andre gets for a tip. In an effort to satisfy the IRS, Andre took a random sample of 8 credit card receipts, each of which had his tip recorded. The results were as follows:
$10.00, $11.93, $15.70, $9.10, $12.75, $11.15, 14.50, $13.65
Find a confidence interval for all tips received by Andre, using this sample.