Question on equivalence class partitions

If a candidate is given an exam of 40 questions should get 25 marks to pass (61%) and should get 80 % for distinctions.
What is equivalence class partitions.

[B][U]Case_1: Assuming no decimal allowed[/U][/B]


-1 or less than 0 (though not possible as marks are always positive, considered for EP for negative test scenario.)
0 to 24 (Fail)
25 to 31 (Pass)
32 to 40 (Distinction)
above 40 (negative test scenario.)


[B][U]Case_2: If decimal allowed in marks[/U][/B]


less than 0.0 (negative test scenario)
1.0 to 24.9 (Fail)
25.0 to 31.9 (Pass)
32.0 to 40.0 (Distinction)
40.01 (negative test scenario)



Please, let me know the replies.

<b>Equivalence class for fail:</b>

[COLOR="DarkRed"][I]less than 1.0 -> Invalid Class
between 1.0 and 24.9 -> Valid Class
above 24.9 -> Invalid Class[/I][/COLOR]

<b>Equivalence class for Pass:</b>

[COLOR="darkred"][I]less than 25.0 -> Invalid Class
between 25.0 and 31.9 -> Valid Class
above 31.9 -> Invalid Class[/I][/COLOR]

<b>Equivalence class for Distinction:</b>

[COLOR="darkred"][I]less than 32.0 -> Invalid Class
between 32.0 and 40.0 -> Valid Class
above 40.0 -> Invalid Class[/I][/COLOR]

Sridhar,

Your reply are very specific and good which segregates the valid and invalid partitions.

Thanks for your reply !