Find the mean of the following scores:
$6$6, $4$4
Find the mean of the following scores:
$8$8, $5$5
Find the mean of the following scores:
$4$4, $10$10, $2$2, $9$9, $5$5
Find the mean of the following scores:
$6$6, $14$14, $10$10, $13$13, $5$5, $9$9, $14$14, $15$15