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Calculate Arithmetic Mean by Step-Deviation Method; also explain why it is better than direct method in this particular case.
Now we will find the Arithmetic Mean as Explanation: Here from the mid points () it is very much clear that each mid point is multiple of and there is also a gap of from mid point to mid point i.e. class size or interval (). Keeping in view this, we should prefer to take method of Step-Deviation instead of Direct Method.
(1) Direct Method:or Marks (2) Short-Cut Method: Where Marks (3) Step-Deviation Method: Where Marks |

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