The following table shows the marks scored by 140 students in an examination of a certain paper:...
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0The following table shows the marks scored by 140 students in an examination of a certain paper:
\( \begin{array}{lccccc}\text { Marks: } & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \text { Number of students: } & 20 & 24 & 40 & 36 & 20\end{array} \)
Calculate the average marks by using all the three methods: direct method, assumed mean deviation and shortcut method.
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