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2 years ago

13

June is working on an addition problem and starts with 17,985. After she adds, she still has 17,985. Which property of addition

did she use?

2 answers:

oksano4ka [1.4K]2 years ago

8 0

Answer:

i think you add 17,985+17,985 but i don not think so

Step-by-step explanation:

podryga [215]2 years ago

3 0

Answer:

addition

Step-by-step explanation:

idkthis sounds dumb

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4) 85+50= 135
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Sorry, IDK the rest. So so sorry.

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3 years ago

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2 years ago

A population has a standard deviation of 5.5. What is the standard error of the sampling distribution if the sample size is 81?

VladimirAG [237]

Answer:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

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

And the standard error would be:

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

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

Step-by-step explanation:

For this case we know the population deviation given by:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

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

And the standard error would be:

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

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

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2 years ago

PLSSS HELP ME!!!!!!!

DanielleElmas [232]

Answer:

y=15

Step-by-step explanation:

Because of the exterior angle theorem angle A plus angle b or equal to 146.

so you set 5y+3+4y+8=146 and solve

5y+3+4y+8=146

9y+11=146

9y=135

y=15

7 0

2 years ago

Read 2 more answers