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The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using...

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of μ = 26.50 mpg and a standard deviation of σ = 3.25 mpg.

(a) What is the standard error of X¯¯¯ , the mean from a random sample of 25 fill-ups by one driver? (Round your answer to 4 decimal places.)
  

(B) Within what interval would you expect the sample mean to fall, with 98 percent probability? (Round your answers to 4 decimal places.)

The interval is from _____ to _____

Please help with B, I just need help understanding the formula and answer

Math   Statistics-And-Probability   
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