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IgorC [24]
2 years ago
13

Geometry

Mathematics
1 answer:
DiKsa [7]2 years ago
5 0

Answer:

18 ft.

Step-by-step explanation:

Area: 216 sq. ft.

1 side: 12 ft.

Area=l x w

216=12 x ?

216/12 = x

x = 18

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The ages of registered voters in Smith County are normally distributed with a population standard deviation of 3 years and an un
eimsori [14]

Answer:

The margin of of error for a 95% confidence interval for the population mean is of 1.39 years.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

The margin of error is:

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

Population standard deviation of 3 years

This means that \sigma = 3

Sample of 18 voters

This means that n = 18

Margin of error:

M = z\frac{\sigma}{\sqrt{n}}

M = 1.96\frac{3}{\sqrt{18}}

M = 1.39

The margin of of error for a 95% confidence interval for the population mean is of 1.39 years.

3 0
3 years ago
EASY BRAINLIEST PLEASE HELP!!
Galina-37 [17]

Answer: B

Step-by-step explanation: its B

8 0
3 years ago
Read 2 more answers
3. Complete the square for 3x2 - 6x = 21.<br> Help
PSYCHO15rus [73]

Answer:

x=1+2√2 or x=1−2√2

Step-by-step explanation:

Let's solve your equation step-by-step.

3x2−6x=21

Step 1: Since the coefficient of 3x^2 is 3, divide both sides by 3.

3x2−6x

3

=

21

3

x2−2x=7

Step 2: The coefficient of -2x is -2. Let b=-2.  

Then we need to add (b/2)^2=1 to both sides to complete the square.

Add 1 to both sides.

x2−2x+1=7+1

x2−2x+1=8

Step 3: Factor left side.

(x−1)2=8

Step 4: Take square root.

x−1=±√8

Step 5: Add 1 to both sides.

x−1+1=1±√8

x=1±√8

x=1+2√2 or x=1−2√2

7 0
3 years ago
Find the value of 4^2 +6 ÷ 2. <br>O 11<br>O 19<br>O 7​
rewona [7]
The correct answer is 19
6 0
3 years ago
Read 2 more answers
Solve and show working for 1/2÷8
JulsSmile [24]
0.0625. 1÷2=0.5÷8=0.0625
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3 years ago
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