Introduction to Data Interpretation
Direction: The histogram shows the marks obtained by 45 students of a class. Look at the histogram and answer the questions.
 If the pass mark be 30, what is the percentage of successful students?

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On the basis of given graph in question ,
Total number of students = 2 + 6 + 10 + 3 + 8 + 4 + 7 + 5 = 45
Number of failures = 2 + 6 + 10 = 18
Number of successful students = 45 – 18 = 27∴ Required percentage = Number of successful students × 100 Total number of students
Correct Option: B
On the basis of given graph in question ,
Total number of students = 2 + 6 + 10 + 3 + 8 + 4 + 7 + 5 = 45
Number of failures = 2 + 6 + 10 = 18
Number of successful students = 45 – 18 = 27∴ Required percentage = Number of successful students × 100 Total number of students Required percentage = 27 × 100 = 60% 45
 If the pass mark be 30, what is the number of failures?

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According to question , we seen in above bar graph
Number of students who obtained 0  10 marks = 2
Number of students who obtained 10  20 marks = 6
Number of students who obtained 20  30 marks = 10Correct Option: C
According to question , we seen in above bar graph
Number of students who obtained 0  10 marks = 2
Number of students who obtained 10  20 marks = 6
Number of students who obtained 20  30 marks = 10
Total number of failures = 2 + 6 + 10 = 18
 How many students have obtained marks 50 and above?

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As per the given bar graph , we see
Number of students who obtained 50  60 marks = 4
Number of students who obtained 60 70 marks = 7
Number of students who obtained 70  80 marks = 5Correct Option: D
As per the given bar graph , we see
Number of students who obtained 50  60 marks = 4
Number of students who obtained 60 70 marks = 7
Number of students who obtained 70  80 marks = 5
Required total number of students = 4 + 7 + 5 = 16
Direction: The following bardiagram shows total number of males and females in five different organisations. Study it carefully to answer the questions.
 What is the ratio of average number of females from the organisations A, B and C to the average number of males from the organisations C, D and E?

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From the given bar diagram , we see
Total number of females from the organisations A, B and C = 3000 + 3500 + 4000 = 10500
Total number of males from the organisations C, D and E = 4700 + 2250 + 3250 = 10200
Number of given organisation = 3
Required ratio = Average number of females from the organisations A, B and C : Average number of males from the organisations C, D and ERequired ratio = Total number of females from the organisations A, B and C : Total number of males from the organisations C, D and E Number of given organisation Number of given organisation
Correct Option: E
From the given bar diagram , we see
Total number of females from the organisations A, B and C = 3000 + 3500 + 4000 = 10500
Total number of males from the organisations C, D and E = 4700 + 2250 + 3250 = 10200
Number of given organisation = 3
Required ratio = Average number of females from the organisations A, B and C : Average number of males from the organisations C, D and ERequired ratio = Total number of females from the organisations A, B and C : Total number of males from the organisations C, D and E Number of given organisation Number of given organisation Required ratio = 10500 : 10200 = 3500 : 3400 = 35 : 34 3 3
 Males from organisations A and B together form what percent of total number of males from organisations C, D and E together?

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As per the given bar graph , we have
Number of males from organisations A and B = 3500 + 4500 = 8000
Total number of males from organisations C, D and E = 4700 + 2250 + 3250 = 10200Required percent = Number of males from organisations A and B × 100 Total number of males from organisations C, D and E
Correct Option: A
As per the given bar graph , we have
Number of males from organisations A and B = 3500 + 4500 = 8000
Total number of males from organisations C, D and E = 4700 + 2250 + 3250 = 10200Required percent = Number of males from organisations A and B × 100 Total number of males from organisations C, D and E Required percent = 8000 × 100 ≈ 78.4 10200