Kamal obtained 81, 68, 82, 69 and 90 marks(out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks?  Choose the correct choice from the following answers.
A) 65	B) 69	C) 72	D) 75	E) NOne
Sol.   Average   = 81 + 68 + 82 + 69 + 90 / 5)   = (390 / 5)= 
<gadget id="calculator">(390 / 5)</gadget>
<output>78</output>
78.   Answer NOne
<result>E</result>
Kamal obtained 81, 68, 82, 69 and 90 marks(out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks?