Singular or plural?

9 marks
2 marks
1.8 marks
1.2 marks
1.0 mark
ZERO marks

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1.8 marks
1.2marks
1.0 mark
ZEROmark (zero is less than one!!)

0.1 marks
0 marks
1.0 marks

FP, it is customary to say how many marks in plural form for test results.
The answer to your question is therefore 'marks' regardless of the number of marks a candidate gets.
(9, 2, 1.8, 1.2, 1.0, O) marks. (http://hubpages.com/hub/Student_scores_Zero_Marks_in_a_True_or_False_Exam)

2010-09-28 07:36:07 補充：
Analogically, we say how many years and months old for a person's age regardless of how old the person is.
The well-respected gentleman is 80 years old.
Her little baby is (O years) 6 months old.

2010-09-29 05:06:59 補充：
FP, just type 1.0 marks, 1.2 marks etc (and 1.0 points etc) in google search and get the references you want. :)

1.8 (marks)
1.2 (marks)
1.0 (marks) after 1.0,there may be some digits (like1.0192746.......)and some one make it correct to 2 sig. fig. or (mark) when it really equal to 1.0
0 (marks)