The median of the list
n, n \plus{} 3, n \plus{} 4, n \plus{} 5, n \plus{} 6, n \plus{} 8, n \plus{} 10, n \plus{} 12, n \plus{} 15
is 10. What is the mean?
<spanclass=′latex−bold′>(A)</span>4<spanclass=′latex−bold′>(B)</span>6<spanclass=′latex−bold′>(C)</span>7<spanclass=′latex−bold′>(D)</span>10<spanclass=′latex−bold′>(E)</span>11