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Liono4ka [1.6K]
3 years ago
14

Tomas correctly spelled 18 out of 20 words in his last spelling quiz.what percent of the words did Tomas spell correctly

Mathematics
2 answers:
Natasha_Volkova [10]3 years ago
6 0
18/20 multiplied by 100 is 90%

Ivan3 years ago
3 0
18/20=9/10 9*10=90%
use the fraction or decimal then multiply by 100 or ten depending
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I would recommend calculatorsoup.com for the fractions part.
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2) Rosa is making a board game that is 16 inches by 24 inches. She wants to use square tiles. What
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8x8

6

GCF

Step-by-step explanation:

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Alexandra earns $125 from her paper route each month, but she spends about $20 each month on personal expenses to pay for a scho
SVEN [57.7K]
125 per month-$20 per month expences=105 savings each month
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If sin(x)=m, with m>0, find the value of sin(pie-x)
viva [34]

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Step-by-step explanation:

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8 0
3 years ago
The Information Technology Department at a large university wishes to estimate the proportion of students living in the dormitor
nadya68 [22]

Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Solution to the problem

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 99% of confidence, our significance level would be given by \alpha=1-0.99=0.01 and \alpha/2 =0.005. And the critical value would be given by:

z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.05 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

We can use as an estimator for p \hat p =0.5. And replacing into equation (b) the values from part a we got:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

3 0
3 years ago
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