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3 years ago

Please help I will be giving a brainliest to the first person to answer please help me

Mathematics

2 answers:

lutik1710 [3]3 years ago

6 0

Step-by-step explanation:

-23 *5 = -115
-8 * -15 = 120
75 * 6 = 450

Hope it helped

Vinil7 [7]3 years ago

3 0

Answer:

1) -115

2) 120

3) 450

Step-by-step explanation:

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A=13.5

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4 years ago

The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of regular gasoline is . The US

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Answer:

The answer is "23, 62, and 139"

Step-by-step explanation:

In point a:

$\to \sigma = \$0.24\\\\ \to E = \$0.10\\\\ 95\% \text{confidence level of the z}: \\\\\to \alpha = 1 - 95\% = 1 - 0.95 = 0.05\\\\\to \frac{\alpha}{2} = \frac{0.05}{2} = 0.025\\\\\to Z_{\frac{\alpha}{2}} = Z_{0.025} = 1.96\\\\$

Calculating the sample size:

$\to n = (\frac{(Z_{\frac{\alpha}{2}} \times \sigma)}{E})^2$

$= (\frac{(1.96 \times 0.24 )}{0.10})^2\\\\= 22.13 \approx 23$

In point b:

$\to \sigma = \$0.24\\\\\to E = \$0.06\\\\\to Z_{\frac{\alpha}{2}} = Z_{0.025} = 1.96\\\\\to n = (\frac{(Z_{\frac{\alpha}{2}} \times \sigma )}{E})^2\\\\$

$= (\frac{(1.96 \times 0.24 )}{0.06})^2\\\\= 61.47 \approx 62$

In point c:

$\to \sigma = \$0.24\\\\\to E =\$0.04\\\\\to Z_{\frac{\alpha}{2}} = Z_{0.025} = 1.96\\\\\to n = (\frac{(Z_{\frac{\alpha}{2}} \times \sigma )}{E})^2\\\\$

$= (\frac{(1.96\times 0.24 )}{0.04})^2 \\\\=138.30 \approx 139$

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3 years ago

Please help I will be giving a brainliest to the first person to answer please help me​

Please help I will be giving a brainliest to the first person to answer please help me