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Dear student,
​​​​​​The solution for question no. 1 is given below:


The solution for question no. 2 is given below:
a) The percentage bar diagram is better over simple bar diagram when the volumes of different attributes are greatly different for making meaningful comparisons then these attributes are reduced to percentages. In that case each attribute will have 100 as its maximum value.
For making the diagram the formula below is used-
      Percentage = (Actual value*100)/ Total of the actual value
b)
 
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