Here is a distribution you have seen before, in Exercise Set 2. It is the distribution of ages in the United States in the year 2010 is given below. Intervals include the left endpoint but not the right; the number of people aged 100 or more was not zero but it was so small that it makes no difference to the table. You can assume that the ages are uniformly distributed within each interval.
Age (Years) Percent
0-5 6.6
5-15 13.3
15-20 7.1
20-30 13.8
30-45 19.8
45-60 20.9
60-75 12.5
75-100 6.0
Source: Adapted from Statistical Abstract 2012
: 6.0 points
Each part is worth 2 points.
a) Estimate the lower quartile:
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b) Estimate the median:
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c) Estimate the upper quartile. Round your answer to one decimal place:
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a) 18.6
b) 36.96
c) 55.33