Question 588483
Hint: For any given confidence interval (a,b) we know the following



Margin of Error: {{{ME = (b-a)/2}}}



Point Estimate (in this case, the sample mean): <img src="http://latex.codecogs.com/gif.latex?\large \overline{\text{x}} = \frac{a+b}{2}" title="\large \overline{\text{x}} = \frac{a+b}{2}" />