3 years ago

Can someone help please?

Mathematics

1 answer:

vaieri [72.5K]3 years ago

7 0

Answer:

Step-by-step explanation:

$x^{2} + 2x =6\\\\x^{2} +2x + 1^{2} = 6 + 1^{2} \\\\(x+1)^{2} = (\sqrt{7})^{2}$

$x+1 = \sqrt{7}$

x = -1 ± $\sqrt{7}$

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Suppose that prices of a certain model of new homes are normally distributed with a mean of $150,000. Use the 68-95-99.7 rule to

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Answer:

C. 47.5%

Step-by-step explanation:

The summary of the given statistics include:

mean =150000

standard deviation: 1200

The objective is to use tributed with a mean of $150,000. Use the 68-95-99.7 rule to find the percentage of buyers who paid: between $150,000 and $152,400

The z score formula can be use to calculate the percentage of the buyer who paid.

$z = \dfrac{X - \mu}{\sigma}$

For the sample mean x = 150000

$z = \dfrac{150000 - 150000}{1200}$

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z = 0

For the sample mean x = 152400

$z = \dfrac{152400 - 150000}{1200}$

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P(150000 < X < 152400) = P(0 < z < 2 )

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3 0

3 years ago

Can someone help please? ​

Can someone help please?