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Chapter 2 Homework Problem
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(201) To investigate water quality, the Columbus Dispatch took water specimens at 16 Ohio State Parking areas in central Ohio. Those specimens were taken to laboratories and tested for E. coll, which are
bacteria that can cause serious gastrointestinal problems. For reference, if a 100-
mer specimen (about 3.3 ounces) of water contains more than 130E. coll bacter, it is considered unsafe. Here are the E. coll levels
per 100 meter found by the laboratories
255
187.6
11.2
15
30.6
86
16.4
45
17
19.5
32
1
8.6
BO
9.6
Find the mean Eco level
Mean (0.01) -
per 100 m
How many of the lakes have E. col levels greater than the mean?
takes have E. col levels are greater than the mean.
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