3 years ago

Lesson 7 skills practice graph on the coordinate plane

Mathematics

1 answer:

Nastasia [14]3 years ago

4 0

Answer:

Step-by-step explanation: need more info

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In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determi

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Answer:

Confidence interval: (1760,1956)

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 81

Sample mean =

$\bar{x} = 1858 \text{ kWh}$

Population standard deviation =

$\sigma = 450 \text{ kilowatt-hours}$

Confidence Level = 95%

Significance level = 5% = 0.05

Confidence interval:

$\bar{x} \pm z_{critical}\displaystyle\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = \pm 1.96$

$1858 \pm 1.96(\displaystyle\frac{450}{\sqrt{81}} ) = 1858 \pm 98 = (1760,1956)$

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2 years ago

Consider Akelia’s sequence 5, 8, 11, 14, 17, ….<br> d. Explain Johnny’s formula.

siniylev [52]

Answer:

Step-by-step explanation:

he is going adding 3 to each number ex.

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2 years ago

In ΔXYZ, the measure of ∠Z=90°, the measure of ∠X=57°, and XY = 8 feet. Find the length of YZ to the nearest tenth of a foot.

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Marizza181 [45]

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8 and 1 third.

Step-by-step explanation:

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2 years ago

You had 15 text messages, deleted 2 then got 5 more, you responded to 4,

Law Incorporation [45]

Answer: The answer is C

Step-by-step explanation: 15 - 2 = 13 13+5=18

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