Please help with question and show work so I can learn how to do it in the future

Please help with question and show work so I can learn how to do it in the future. Thank you in advance.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 25.9 mpg and a standard deviation of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?
Answer: _____________ Round your answer to 4 decimal places as necessary. For example, 0.1357 would be a legitimate entry.
 
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