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3 years ago

Help and explain

Mathematics

1 answer:

krok68 [10]3 years ago

5 0

Answer:

The surface area of the composite figure is 1108 square inches.

Step-by-step explanation:

The surface area of the composite figure ( $A_{T}$ ) is equal to the sum of external faces of the rectangular and triangular prisms, all measured in square inches:

$A_{T} = 20\,in \times 12\,in + 2\times 5\,in \times 12\,in + 2\times 20\,in \times 5\,in + 2\times 20\,in \times 11\,in + 2\times \frac{1}{2}\times 12\,in \times 9\,in$

$A_{T} = 1108\,in^{2}$

The surface area of the composite figure is 1108 square inches.

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The answer is below

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The margin of error (E) is given as:

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Given that the confidence level (c) = 88% = 0.88

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The z score of α/2 is the same as the z score of 0.44 (0.5 - 0.06) which is equal to 1.56

The margin of error (E) is given as:

$E=Z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} } =1.56*\frac{12}{\sqrt{45} } =2.8$

The confidence interval = μ ± E = 23 ± 2.8 = (22.2, 25.8)

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Step-by-step explanation:

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