In a public health study, a histogram was plotted showing the number of cigarettes smoked per day by each subject, as shown below. The numbers on top of each bar represent its heights. You may assume that the values are spread uniformly across each interval. What is the first quartile (or the 25 percentile) of the values?

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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In a public health study, a histogram was plotted
showing the number of cigarettes smoked per day by
each subject, as shown below. The numbers on top of
each bar represent its heights. You may assume that
the values are spread uniformly across each interval.
What is the first quartile (or the 25 percentile) of the
values?
(3.5)
(1.5)
( 1.5)
(0.5)
10
20
40
80
Number of cigarettes
between 36 and 37 cigarettes
O 20 cigarettes
between 12 and 13 cigarettes
between 22 and 23 cigarettes
O 40 cigarettes
% per cigarette
3.
Transcribed Image Text:In a public health study, a histogram was plotted showing the number of cigarettes smoked per day by each subject, as shown below. The numbers on top of each bar represent its heights. You may assume that the values are spread uniformly across each interval. What is the first quartile (or the 25 percentile) of the values? (3.5) (1.5) ( 1.5) (0.5) 10 20 40 80 Number of cigarettes between 36 and 37 cigarettes O 20 cigarettes between 12 and 13 cigarettes between 22 and 23 cigarettes O 40 cigarettes % per cigarette 3.
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