Use the Following Information for Questions

Short Answer

Use the following information for questions:
A gasoline tank for a certain car is designed to hold 15 gallons of gas. The manufacturer of this gasoline tank claims that the actual capacity of a randomly selected tank has a distribution that is approximately normal with a mean of 15.0 gallons. A random sample of 25 tanks results in an average of 14.8 gallons with a standard deviation of 0.42 gallons.
-What are the degrees of freedom for the t-distribution?