A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Transcribed Image Text:A researcher for the EPA measured the amount of arsenic in the water near a sewage treatment plant. Over 5 days, he took \( n = 20 \) measurements (in ppb). His sample data is summarized in the ogive graph shown below.
**Graph Description:**
- The graph is an ogive chart plotting cumulative frequency of arsenic levels (in ppb).
- The x-axis represents arsenic levels, ranging from 10 to 55 ppb.
- The y-axis represents cumulative frequency, ranging from 0 to 20.
- The data points on the graph increase progressively, showing cumulative frequency values at arsenic levels 10, 15, 20, 25, 30, 35, 40, 45, and 50 ppb.
**Question:**
How many measurements taken in this time frame were within [35, 40) ppb?
**Answer:**
ans = ___
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