Mathematics, 02.11.2020 17:00 emmacate

At a convention, 192 speakers gave one or more presentations of varying lengths. The histogram summarizes the total presentation time, in hours, of each speaker.
90
80
Number of speakers
60
50
40
30
10
0
0
1
2 3
4
5 6
Total presentation time (hours)
What interval contains the 25th percentile for this data?

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