Listed below are the lenths (in minutes) of randomly selected music CDs. Construct a 95% confidence interval for the mean length of all such CDs.
$\begin{array}{lllllll} 64.64& 49.74& 38.99& 55.69& 49.55& 51.39& 56.45 \cr 64.09& 53.05& 59.12& 49.08& 59.38& 81.51& 60.74 \cr 41.93& 49.14& 60.63& 53.38& 32.15& 55.68& 61.8 \cr 71.4& 40.55& 76.23& 70& 56.48& 35.91& 41.91 \cr 56.72& 69.55& 55.24& 59.52& 48.71& 57.69& 36.99 \cr 63.92& 49.38& 62.37& 80.01& 64.2 \cr \end{array}$
$< \mu <$