Statistics

. Question 4

Question 4 8 6 4 2 3 5 7 13 Based on the histogram above, what is the class width? Class width = What iS the sample Size? Sample size = Question 5 A researcher for the EPA measured the amount of arsenic in the water near a sewage treatment plant. Over 12 days, he took n = 40 measurements (in ppb). His sample data is summarized in the frequency distribution polygon shown below. .10. How many measurements taken in this time frame were within 120, 25) ppb? Question 9 Calculate the 40th percentile of the data shown 3.8 4.3 6.9 15.8 19 20.2 26.8 28.4 29.9