The arithmetic mean of a set of 50 numbers is 38. If two numbers of the set, namely 45 and 55, are discarded, the arithmetic mean of the remaining set of numbers is:<spanclass=′latex−bold′>(A)</span>38.5<spanclass=′latex−bold′>(B)</span>37.5<spanclass=′latex−bold′>(C)</span>37<spanclass=′latex−bold′>(D)</span>36.5<spanclass=′latex−bold′>(E)</span>36