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The following table shows the marks sco...

The following table shows the marks scored by 140 students in an examination of a certain paper:
`{("Marks",0-10,10-20,20-30,30-40,40-50),("No. of students",20,24,40,36,20):}`
Calculate the average marks by using all the three methods: direct method, assumed mean deviation and shortcut method.

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