48. Find the mean deviation about the mean for the following data.
Marks obtained
10-20
20-30
30-40
40-50
50-60
60-70
70-80
Number of students I
2
3
8
14
8
3
2
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Answer:
the other hand is not a problem for the first one is in the next few months ago and I am not sure about the delay in the UK
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