David obtained 70, 60, 78, 60 and 65 marks (out of 100) in English, Mathematics,Physics, Chemistry and Biology What are his average marks ? Select the correct option.
A) 75 B) 27.6 C) 66.6 D) 16.5 E) 11

Rationale: "explanation : average = ( 70 + 60 + 78 + 60 + 65 ) / 5 = 333 / 5 = 66.6 . answer : c"
Answer: C