Question : Study the given table and answer the question that follows.
The table shows the number of people who responded to a survey about their favourite style of music.
| Age | 18-20 | 21-30 | 31+ |
| Classical | 8 | 5 | 15 |
| Pop | 5 | 11 | 10 |
| Hip-Hop | 6 | 9 | 8 |
| Rock | 9 | 7 | 13 |
| Total | 28 | 32 | 46 |
What percentage of the total sample indicated that Rock is their favourite style of music (rounded off to 2 decimal places)?
Option 1: 27.36%
Option 2: 18.25%
Option 3: 29.65%
Option 4: 22.35%
Correct Answer: 27.36%
Solution :
Number of people who like rock = 9 + 7 +13 = 29
Total samples = 28 + 32 + 46 = 106
Required percentage = $\frac{\text{People who likes rock}}{\text{Total samples}}\times100$
= $\frac{29}{106}\times100$
= 27.358
= 27.36 (rounded off to 2 decimal places)
Hence, the correct answer is 27.36.
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