There are 160 people who are likely to order an appetizer.
In order to find this, you first divide 60 by 12 to get 5. This means 1 out of every 5 people buys an appetizer, so to find how many out of 800 buy an appetizer, you divide 800 by 5. Thus getting 160 as an answer.
can be either a representation of the entire or a sample of a population. Descriptive statistics are broken down into measures of central tendency and measures of variability (spread).