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Two Girls' Quiz Scores

SATMAT-Y41APR

Ang and Lisa each took four quizzes which were worth $ 10 $ points per quiz. The $2$ girls' scores were $ 5 $, $ 6 $, $ 7 $,$ 8 $, $ 9 $, $ 9 $, $ 10 $, and $ 10 $. (Note: the two girls' scores are mixed together in this list- the scores are not separated by student.)

If the mean of Lisa's scores was $ 7.5 $, then what was the mean of Ang's scores?

A

$7.5$

B

$8$

C

$8.5$

D

$9$