![subject](/tpl/images/cats/mat.png)
Mathematics, 05.05.2020 04:14 azzyla2003
The Water Department checks the city water supply on a regular basis for
contaminants such as xylenes. The Water Department takes 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?
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 14:50
Name the most appropriate metric unit for each measurement like the mass of cow
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 16:10
Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 18:30
Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.
Answers: 1
![question](/tpl/images/cats/mat.png)
You know the right answer?
The Water Department checks the city water supply on a regular basis for
contaminants such as...
contaminants such as...
Questions
![question](/tpl/images/cats/istoriya.png)
History, 19.11.2020 05:40
![question](/tpl/images/cats/istoriya.png)
History, 19.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 05:40
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 19.11.2020 05:40
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 05:40
![question](/tpl/images/cats/en.png)
English, 19.11.2020 05:40
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 19.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
English, 19.11.2020 05:40
![question](/tpl/images/cats/ekonomika.png)
Business, 19.11.2020 05:40