The average weight of a class of 20 boys was calculated to be 58.4 kgs and it was later found that one weight was misread as 56 kg instead of 62 kg. What is the correct weight?  Choices:
A) 58 kgs  B) 58.85 kgs  C) 58.7 kgs  D) 59 kgs  E) 59.85 kgs

Rationale: "actual total weight is ( 20 x 58.4 - 56 + 62 ) = 1174 kgs actual average weight is 1174 / 20 = 58.7 kgs c"
Answer: C