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Obliczanie przedziału t dla średniej

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An economist studying fuel costs wants to estimate the mean price of gasoline in her state on a certain day. On that day, she takes an
of 12 gas stations and finds the sample mean price (in dollars per gallon) is x, with, \bar, on top, equals, dollar sign, 2, point, 29 with a standard deviation of s, start subscript, x, end subscript, equals, dollar sign, 0, point, 20. The prices in the sample are roughly symmetric with no distinct outliers.
Based on this sample, which of the following is closest to a 90, percent confidence interval for the mean price of gasoline that day in her state?
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