Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from $2.83 to $3.86. Use the fact that the confidence interval for the mean...

Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from $2.83 to $3.86. Use the fact that the confidence interval for the mean is in the form x −
E
to x +
E
to compute the sample mean and the maximal margin of error
E. (Round your answers to two decimal places.)