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bagirrra123 [75]
3 years ago
11

The water department checks the city water supply on a regular basis for contaminants such as xylenes. the water department take

s 200 samples and estimates that the concentration of xylenes in your drinking water is 3.5 ppb (parts per billion), with a standard deviation of 0.2 ppb.
assuming the samples were random and unbiased, how much confidence can you have in this data?

Mathematics
1 answer:
Novosadov [1.4K]3 years ago
6 0

Answer:

Its A

Step-by-step explanation:

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