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Mean of Grouped Data using Step Deviation Method

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Multiple Choice

The arithmetic mean in a measure of central tedency and is popularlyknown as mean. Arithmetic mean is obtained by dividing the sum of the values of all items of a series by the number of items of that series. Normally, arithmetic mean is denoted by $\bar X$ which is red as  '$X$ bar'. It can be computed for unclassified or ungrouped data or individual series as well as classified or grouped data or discrete or continuous series.

From the following data calculate arithmentic mean.

Marks 0-10 10-20 20-30 30-40 40-50 50-60
No. of students 10 20 30 50 40 30


  1. $25$
  2. $40$
  3. $15$
  4. $35$
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