Final answer:
The distribution to use for the average cost of gasoline for the 16 gas stations is the normal distribution.
Step-by-step explanation:
The distribution to use for the average cost of gasoline for the 16 gas stations is the normal distribution. This is because the problem states that the cost of unleaded gasoline follows an unknown distribution, and the normal distribution is commonly used to model such data. The problem provides the mean and standard deviation, which are the parameters required to define a normal distribution.