Stats homework problem help??? Confidence levels??

I don't understand the follow questions, can someone help me work it out??
You have started the Blissful Catering Company. Based on the first five months of business, you have noticed that there is almost always a lot of food that goes uneaten. Because this left over food diminishes your profits, you have decided to use statistics to determine how much food should be prepared for the receptions you cater. For the ten receptions for which you have data, the following data represent the average number of chocolate covered strawberries eaten or abused per person.

4 6 3 2 7 4 4 5 3 4

Assuming these data form an excellent random sample, what is the number of chocolate covered strawberries you SHOULD prepare for a reception of 100 people and be 95% confident of have enough strawberries.