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3 years ago

Which number line model represents the expression -4+7.25

Mathematics

1 answer:

igor_vitrenko [27]3 years ago

4 0

Answer: c

Step-by-step explanation: start at -4 then add 7 to that then .5

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Rosetta wants to estimate the percentage of people who rent their home. She surveys 250 individuals and finds that 48 rent their

Andreas93 [3]

Answer:

$0.192 - 1.645\sqrt{\frac{0.192(1-0.192)}{250}}=0.151$

$0.192 + 1.645\sqrt{\frac{0.192(1-0.192)}{250}}=0.233$

Step-by-step explanation:

Information given

$X= 48$ number of people who rent their home

$n= 250$ represent the sample size

$\hat p =\frac{48}{250}= 0.192$ represent the proportion of people who rent their home

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by $\alpha=1-0.90=0.1$ and $\alpha/2 =0.05$ . And the critical value would be given by:

$z_{\alpha/2}=\pm 1.645$

The confidence interval for the mean is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

If we replace the values obtained we got:

$0.192 - 1.645\sqrt{\frac{0.192(1-0.192)}{250}}=0.151$

$0.192 + 1.645\sqrt{\frac{0.192(1-0.192)}{250}}=0.233$

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2 years ago

Select the correct answer.

77julia77 [94]

I’m pretty
Shore it’s b

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3 years ago

A rectangle has an area of 40 square units. The length is 6 units greater than the width.

vampirchik [111]

The length is 10
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Help on numbers 1 and 2<br> any question, 1 or 2.

geniusboy [140]

For #2 you would count how many where the red dashed line is! Which is 3! Then you would count where the blue dashed line is! Which is 4! So then it would be 4/3(4 over 3) For the slope! Hope this helps! :)

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3 years ago

What is 2+2 <br> I'm really am wondering

Delvig [45]

4 is the answer to 4+4

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2 years ago

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