1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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:

You might be interested in
X/9 times 15-47=28<br> help pls
DIA [1.3K]

Answer:

x=45

Step-by-step explanation:

Then,

x/5(15)-47=28

Step 1: Simplify the equation on both sides

x/9(15)-47=28

5/3x-47=28

Step 2: Add 47 to both sides

5/3x-47+47=28+47

5/3x=75

Step 3: Multiply both sides by 3/5

(3/5)*(5/3x)=(3/5)*(75)

x=45

4 0
2 years ago
Is 87 composite or prime
ankoles [38]
87 is a composite number 
5 0
4 years ago
Read 2 more answers
Angles and transversals thank you
faltersainse [42]

Answer:

#11-13: 118 , 97 , 62

#7-10: 92 , 125 , 56 , 130

Step-by-step explanation:

#11. Supplementary angles (A + B = 180)

  • (n + 7) + (3n - 47) = 180
  • n = 55
  • <ABC = 3(55) - 47 = 118 degrees

#12. Supplementary angles

  • 83 + x = 180
  • x = 97
  • <ABC = 97 degrees

#13. Congruent angles (A = B)

  • (8x - 34) = (5x +2)
  • x = 12
  • <DEF = 5 (12) + 2 = 62 degrees

#7. Congruent angles

  • (3x +23) = 4x
  • x = 23
  • <ABC = 4(23) = 92 degrees

#8. Congruent angles

  • 5x = (3x + 50)
  • x = 25
  • <MPQ = 3(25) + 50 = 125 degrees

#9. Congruent angles

  • (a + 28) = 2a
  • a = 28
  • <MNP = (28) + 28 = 56 degrees

#10. Congruent angles

  • 5y = (2y + 78)
  • y = 26
  • <WXZ = 5(26) = 130 degrees

I hope this helps!

7 0
3 years ago
Tell whether each statement below is true or false. If it is
Alexxandr [17]

Answer:

Step-by-step explanation:

add me on social media dimples.hope

4 0
3 years ago
You want to get a Dodgers shirt for Opening Day. The shirt you want is $36. Luckily, it is marked 25% off. You will have to pay
OlgaM077 [116]

Answer:

Part A

= $9

Part B

= $3.24

Part C

= $30.24

Step-by-step explanation:

Part A

= 36÷100x25

= $9

Part B

=36÷100x9

=$3.24

Part C

=36-9

=27

Then

=27+3.25

= $30.24

6 0
3 years ago
Other questions:
  • How to tell if an expression is a polynomial?
    10·1 answer
  • The table shows the annual profits (in thousands of dollars) of a county fair from 2008 to 2012. What must the 2012 profit be (i
    5·2 answers
  • What the correct answer fast
    14·1 answer
  • HELP PLEASE, I don’t understand:(!
    7·1 answer
  • Write an expression to represent . Eight less than the product of two and a number x
    5·1 answer
  • Solving by elimination
    14·1 answer
  • Does anyone know how to do this ?
    8·1 answer
  • How much 9% saline solution should be mixed with 80 Cc of a 17% saline solution to produce a 13% saline solution?
    11·1 answer
  • Please help I'm stuck :/
    15·2 answers
  • Changing a single verb can change the story the sentence creates.<br>a.true<br>b.false​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!