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bagirrra123 [75]

4 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?

1 answer:

Novosadov [1.4K]4 years ago

6 0

Answer:

Its A

Step-by-step explanation:

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Lyrx [107]

Given:

A figure.

To find:

The value of x.

Solution:

Draw two parallel lines as shown in the below figure.

If a transversal line intersect two parallel lines, then alternate interior angles are same.

$a=20$ (Alternate interior angle)

$d=b$ (Alternate interior angle) ...(i)

The value of angle d is

$d=50-a$

$d=50-20$

$d=30$

Using (i), we get

$b=30$

If a transversal line intersect two parallel lines, then same sides interior angles are supplementary angles.

$c+140=180$

$c=180-140$

$c=40$

Now,

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-1.2= y/2.4 -1.7<br> Solve for y

evablogger [386]

${\huge{\boxed{\sf{Question}}$

$-1.2= y\div2.4 -1.7$

Solve for y

${\huge{\boxed{\sf{Answer\:with\:explanation }}}$

let's put our equation first

$-1.2= y\div2.4 -1.7$

Flip the equation

$y\div2.4-1.7=-1.2$

Now follow the rule of $BOMDAS/PEMDAS$

${\huge{\boxed{\sf{BOMDAS }}}$

Brackets

Of multiplication

Division

Addition

Subtraction

${\huge{\boxed{\sf{PEMDAS}}}$

Parenthesis

Exponents

Multiplication

Division

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_________________________

${\huge{\boxed{\sf{Solve\:the\:equation}}}$

_________________________

$y\div2.4-1.7=-1.2$

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$0.416667y-1.7=-1.2$

add $1.7$ to both sides

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Divide both sides by $0.416667$

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${\huge{\boxed{\sf{Answer}}}$

$y$ would equal $1.2$

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