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3 years ago

Please help me I been trying all day to do these but I can't it need to be all correct but I'm straggling ;(

Mathematics

1 answer:

Dafna11 [192]3 years ago

8 0

You can use an app called photomath
Or a graphing calculator app
I did the first

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Rewrite the fraction in simplest form.<br> 18/24

Thepotemich [5.8K]

The greatest common fact is 6.

18 ÷ 6 = 3
24 ÷ 6 = 4

In simplest form, 18/24 = 3/4

4 0

3 years ago

In a recent year, Washington State public school students taking a mathematics assessment test had a mean score of 276.1 and a s

Oksi-84 [34.3K]

Answer:

a) $\mu_{\bar x} =\mu = 276.1$

$\sigma_{\bar x} =\frac{\sigma}{\sqrt{n}}=\frac{34.4}{\sqrt{64}}=4.3$

b) From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu=276.1, \frac{\sigma}{\sqrt{n}}=4.3)$

c) $P(\bar X \geq 285)=P(Z\geq \frac{285-276.1}{4.3}=2.070)$

$P(Z\geq2.070)=1-P(Z$

Step-by-step explanation:

Let X the random variable the represent the scores for the test analyzed. We know that:

$\mu=E(X) = 276.1 , \sigma=Sd(X) = 34.4$

And we select a sample size of 64.

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Part a

For this case the mean and standard error for the sample mean would be given by:

$\mu_{\bar x} =\mu = 276.1$

$\sigma_{\bar x} =\frac{\sigma}{\sqrt{n}}=\frac{34.4}{\sqrt{64}}=4.3$

Part b

From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu=276.1, \frac{\sigma}{\sqrt{n}}=4.3)$

Part c

For this case we want this probability:

$P(\bar X \geq 285)$

And we can use the z score defined as:

$z=\frac{\bar x -\mu}{\sigma_{\bar x}}$

And using this we got:

$P(\bar X \geq 285)=P(Z\geq \frac{285-276.1}{4.3}=2.070)$

And using a calculator, excel or the normal standard table we have that:

$P(Z\geq2.070)=1-P(Z$

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3 years ago

Which expressions are equivalent to ( 10 x 18) + (10 x s)

kolezko [41]

Answer:

10×18=180

180+(10s)

if it is equal to zero

s is -18

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3 years ago

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Step-by-step explanation:

I hope it will help you

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2 years ago

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Would this be h=4 or h=12?<br> 4=h-8

blsea [12.9K]

Answer:

H=12

Step-by-step explanation:

12-8=4

hope this helps!!

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2 years ago