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Katen [24]
3 years ago
12

Need help in this please​

Mathematics
1 answer:
Alona [7]3 years ago
8 0
Hmmm this is a little hard I believe c
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A random sample of 64 items is selected from a population of 400 items. The sample mean is 200. The population standard deviatio
Usimov [2.4K]

Answer:   (188.24,\ 211.76 ).

Step-by-step explanation:

Given : Sample size : n= 64 , the sample is a large sample (n>30), so we can apply z-test.

Sample mean = \overline{x}=200

Standard deviation : \sigma=48

Level of confidence:1-\alpha=0.95

\Rightarrow\ \alpha=0.05

Then, critical z-value =z_{\alpha/2}=1.96

The  confidence interval to estimate the population mean is given by :_

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

=200\ \pm\ (1.96)\dfrac{48}{\sqrt{64}}\\\\=200\pm11.76=(200-11.76, 200+11.76)=(188.24,\ 211.76 )

Hence, the  95% confidence interval to estimate the population mean can be computed as (188.24,\ 211.76 ).

7 0
3 years ago
Ellen earns a weekly base salary of $450 plus a commission rate of
Mademuasel [1]

Answer:

she broke

Step-by-step explanation:

she broke

4 0
2 years ago
This problem asks you to investigate the average value of some different quantities.
son4ous [18]

Answer:

429

Step-by-step explanation:

First You add 2+2 and then you add 205+123+101+7

3 0
3 years ago
A small juice company spends $1200 per day on business expenses plus $1.10 per bottle of juice them make. They charge $2.50 for
Greeley [361]
Cost price per bottle of juice = $1.10 
Selling price per bottle of juice = $2.50 
Profit per bottle of juice = $2.50 - $1.10 = $ 1.40 
Let B be the number of bottles needed to sell in one day in order to equal its daily costs. 
$1200 = $1.40B 
857.14285714285714 = B 
858 = B (round off to the nearest bottle) 

The company must sell 858 bottles of juice in one day in order to equal its daily cost. 

Hope this helps! =)


5 0
3 years ago
PLS HELP ASAP FIRST CORRECT ANSWER GETS BRAINLIEST​
Anna11 [10]
Using Pythagorean, a^2 + b^2 = c^2
16 +x^2 = 36.69
Then subtract the 16 from 36.69, which is 23.69
And finally take the square root of that, giving you 4.87
6 0
2 years ago
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