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? per cigarette % N r 40 cigarettes (1.5) 20 cigarettes (3.5) O 10 between 22 and 23 cigarettes between 36 and 37 cigarettes between 12 and 13 cigarettes (1.5) 40 (0.5) 20 Number of cigarettes 80

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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?
% per cigarette
Q 1
1
1
40 cigarettes
(1.5)
20 cigarettes
(3.5)
O 10
between 22 and 23 cigarettes
between 36 and 37 cigarettes
between 12 and 13 cigarettes
(1.5)
(0.5)
20
Number of cigarettes
40
80
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? % per cigarette Q 1 1 1 40 cigarettes (1.5) 20 cigarettes (3.5) O 10 between 22 and 23 cigarettes between 36 and 37 cigarettes between 12 and 13 cigarettes (1.5) (0.5) 20 Number of cigarettes 40 80
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