3 years ago

Please answer the question in the photo that I have attatched. Please also explain how to solve it so I may solve the others.

Mathematics

1 answer:

Svet_ta [14]3 years ago

8 0

Use Pythagorean theron: a^2 + b^2 = c^2

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Use the confidence level and sample data to find a confidence interval for estimating the population mu. Round your answer to th

Schach [20]

Answer: $(587.67,596.33)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\ \pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample mean : $\overline{x}= 592$ hours

Standard deviation $\sigma= 25$ hours

Sample size : n=90, which is a large sample(n<30), so we use z-test.

Significance level: $1-0.90=0.1$

Critical value : $z_{\alpha/2}=t_{22,0.025}=1.645$

Then , the confidence interval for population mean will be :-

$592\ \pm\ (1.645)\dfrac{25}{\sqrt{90}}\\\\\approx592\pm4.33\\\\=(592-4.33,592+4.33)\\\\=(587.67,596.33)$

Hence, the 90% confidence interval for the mean life $\mu$ of all light bulbs of this type. is $(587.67,596.33)$

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4 years ago

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Marina CMI [18]

Answer:

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3 years ago

Determine the intercepts of the line. y = 11 x + 6

Vinil7 [7]

Answer:

intercepts are (-6/11 , 0) and ( 6,0 )

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3 years ago

25-(<img src="https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%2016" id="TexFormula1" title="\sqrt{x} 16" alt="\sqrt{x} 16" align="absmidd

Mnenie [13.5K]

Y= 39x 2

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3 years ago

Which value of f makes 3f+5=32 a true statement? a. f=6 b. f=8 c. f=9 d. f=12

DIA [1.3K]

We just need to solve the equation in order to find the value.

$3f+5=32$

So we subtract 5 from both sides of the euqation and get

$3f=27$

Now we divide by 3 on both sides and get

$f=9$

So the answer is C.

Hope this helps!

6 0

3 years ago

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