[tex]\begin{gathered} CI=\mu\pm T(\frac{\sigma}{\sqrt{n}}) \\ CI=3407\pm1.292(\frac{2539}{\sqrt{81}}) \\ CI=3407\pm1.292(\frac{2539}{9}) \\ CI=3407\pm1.292(282.111111) \\ CI=3407\pm364.448 \\ CI=(3042.552,3771.448) \end{gathered}[/tex]
So the confidence value with a t value of 1.292 is between (3044,3771)
Option C) Between $3044 and $3771