Question : Study the given graph and answer the question that follows
The given graph represents the percentage of books on different subjects that a person has in his library.
If the total number of books is 60, then what is the ratio of the number of books on subject C1 to the average number of books per subject?
Option 1: 3 : 7
Option 2: 2 : 3
Option 3: 3 : 5
Option 4: 2 : 5
Correct Answer: 2 : 5
Solution :
The number of books C1 = 10% of 60 = 6
Average = $\frac{\text{Sum of all the observations}}{{\text{Total number of observations}}}$
The average number of books per subject = $\frac{60}{4}=15$
Required ratio = 6 : 15 = 2 : 5
Hence, the correct answer is 2 : 5.
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