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Construct a frequency distribution table...

Construct a frequency distribution table for the following marks obtained by 25 students in a history test in class VI of a school: 9,17,12,20,9,18,25,17,19,9,12,9,12,18,17,19,20,25,9,12,17,19,19,20,9 What is the range of marks? What is the highest mark? Which mark is occurring more frequently?

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The range of the data 12,25,15,18,17,20,22,0,16,11,8,19,10,30,20,38, is

Find the mean deviation about the mean for the following data : 17,20,12,13,15,16,12,18,15,19,12,11

{:(11,6,8),(17,12,?),(25,34,19),(19,28,11):}