The frequency distribution of marks obtained by 28 \( \mathrm{P} \)...

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The frequency distribution of marks obtained by 28
\( \mathrm{P} \) students in a test carrying 40 marks is given below:

W
\( \begin{array}{lcccc}\text { Marks: } & 0-10 & 10-20 & 20-30 & 30-40 \\ \text { Number of students: } 6 & x & y & 6\end{array} \)
If the mean of the above data is 20 , then the difference between \( x \) and \( y \) is
(1) 3
(2) 2
(3) 1
(4) 0
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