The Scores Below Are from the Same Final Exam Given $\underline { \text { This year } }$

The scores below are from the same final exam given in a math class in two different years.Compute the mean and median (if necessary)and the range and standard deviation of these scores.Using these statistics,describe the differences in the two sets of scores.
$\underline { \text { This year } }$
$\begin{array}{llll}35 \quad\quad& 45 \quad\quad& 65 \quad\quad& 75 \\80 & 69 & 71 & 53 \\99 & 95 & 70 & 82 \\93 & 67 & 61 & 57 \\72 & 77 & 71 & 81\end{array}$

$\underline { \text { Ten years' } }$
$\underline { \text { ago } }$
$\begin{array}{llll}56 \quad\quad& 77 \quad\quad& 75 \quad\quad& 76 \\74 & 51 & 89 & 55 \\67 & 77 & 69 & 90 \\90 & 65 & 79 & 69 \\87 & 86 & 98 & 91\end{array}$