The average of 50 numbers is 38. If two numbers 45 and 55 are discarded, the average of the remaining set of numbers is
Choose the correct option:  A) 38.5  B) 37.5  C) 37.0  D) 36.5  E) none of these

Rationale: average of the remaining set of numbers [ 50 x 38 - ( 45 + 55 ) ] / ( 50 - 2 ) = ( 1900 - 100 ) / 48 = 37.5 answer : b
Answer: B