A Random Sample of 9 TI-89 Titanium Calculators Being Sold $\begin{array} { l l l l l } \hline 151 & 160 & 136 & 132 & 140 \\\hline 151 & 137 & 119 & 145 & \\\hline\end{array}$

A random sample of 9 TI-89 Titanium calculators being sold over the internet had the following prices, in dollars.

$\begin{array} { l l l l l } \hline 151 & 160 & 136 & 132 & 140 \\\hline 151 & 137 & 119 & 145 & \\\hline\end{array}$

Assume the population standard deviation is $\sigma = 34$ and that the population is approximately normal.
Construct a 90% confidence interval for the mean price for all the TI-89's being sold over the
Internet.

A) (134.6, 147.9)
B) (122.6, 159.9)
C) (85.3, 197.2)
D) (134.2, 148.2)