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Radda [10]
3 years ago
8

Sooooooooooooooooooooo can someone help with this

Mathematics
2 answers:
igor_vitrenko [27]3 years ago
8 0

82 + 67 = 146

180 - 146

Angle ? = 44

Arturiano [62]3 years ago
8 0

Step-by-step explanation:

Triangle adds up to 180°

So 67° + 82° = 149°

Then you 180° - 149° = 31°

Finely 67° + 82° + 31° = 180°

Answer = 31°

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An unconfined compression test was performed to determine the average strength of concrete cylinders (in psi). It is believed th
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Answer:

Explained below.

Step-by-step explanation:

(1)

The confidence level is, 91%.

Compute the value of α as follows:

\text{Confidence level}\% =(100-\alpha \%)\\\\91% = 100-\alpha \%\\\\\alpha \%=100-91\%\\\\\alpha \%=9\%\\\\\alpha =0.09

(2)

As the population standard deviation is provided, i.e. <em>σ</em> = 256 psi, the <em>z</em> value would be appropriate.

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<em>z</em> = 1.69

(3)

Compute the 91% confidence interval as follows:

CI=\bar x\pm z_{\alpha/2}\cdot\frac{\sigma}{\sqrt{n}}

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(4)

The 91% confidence interval for population mean implies that there is a 0.91 probability that the true value of the mean is included in the interval, (2942.29, 3057.71) psi.

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3 years ago
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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