Answer:
28. (b) 3950
29. 37.3%
Explanation:
If 5000 visitors answered a survey and 21% said they were "25 or under," you want to know the number of visitors over 25. If 1865 visitors answered "yes" to the second question on the same survey, you want to know the percent who answered "yes."
28. Over 25
The number who said they were 25 or under was ...
0.21 × 5000 = 1050
Hence the number over 25 is ...
5000 -1050 = 3950
(b) 3950 visitors are over 25.
29. Percent
The fraction who answered "yes" can be made a percent by multiplying by 100%.
1865/5000 × 100% = 0.373 × 100% = 37.3%
The percentage of visitors who answered "yes" was 37.3%.
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