The given bar graph shows the data of the number of students who were called for an interview by a company 'XYZ' from three different institutes A, B and C over the years. Study the bar graph and answer the question.

What is the ratio of the average number of students called for an interview from institute C in the period 2018 to 2020 to the average number of students called for an interview from institute B in the same period?

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RRB Group D 1 Sept 2022 Shift 1 Official Paper
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  1. 1 ∶ 3
  2. 13  12
  3. 12  13
  4. 14  15

Answer (Detailed Solution Below)

Option 3 : 12  13
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RRB Group D Full Test 1
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Detailed Solution

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Given:

For institute B,

  • The  number of students called for an interview in year 2018 is 120 
  • The  number of students called for an interview in year 2019 is 92 
  • The  number of students called for an interview in year 2020 is 100

For institute C,

  • The number of students called for an interview in year 2018 is 108 
  • The number of students called for an interview in year 2019 is 100 
  • The number of students called for an interview in year 2020 is 80

Calculation :

 The average number of students called for an interview from institute B in the period 2018 to 2020 =  = 104

 The average number of students called for an interview from institute C in the period 2018 to 2020 =  = 96

Now,

The ratio of the average number of students called for an interview from institute C in the period 2018 to 2020 to the average number of students called for an interview from institute B in the same period is 96:104  = 12 : 13.

That is , The Required ratio is 12:13.

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