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Answer: C

EXplanation: The number who prefer Rock is 12 and the number who prefer Jazz is 4. This gives a ratio of 12:4 which can also be expressed as 3:1 (divide both figures by 4).

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Answer: E

Explanation: The total number who prefer Jazz is 1+4+11 = 16. The total sample size is 33+33+68 = 134. Therefore (16/134) * 100 = 11.9% of the total sample prefer Jazz.

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Answer: A

Explanation: This question is concerned only with respondents 21 to 30 years old. Since 12 out of 33 respondents in this group prefer Rock, then 21 must prefer other styles. Note that working it out this way minimises the number of calculations you need to make.

Therefore (21/33) * 100 = 63.6% of respondents 21 to 30 years old prefer a style other
than Rock.

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Answer: B

Explanation: This question is concerned only with respondents under 31 years old. The number who indicated that Blues was their favourite style was 5 (2+3) out of a total of 66 (33+33). Therefore (5/66) * 100 = 7.5%

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Answer: E

Explanation: The total number of students studying medicine is (4560/100) * 5 = 228
If 34 are from Europe then this represents (34/228) * 100 = 14.9%