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attashe74 [19]
3 years ago
9

Write an equation for each description. a number increased by 10 is 114

Mathematics
2 answers:
ziro4ka [17]3 years ago
6 0

answer: n + 10 = 114 <em>(n = 104 if this is needed)</em>

work:

let's analyze the equation.

a number increased by 10 is 114

<em>let's use n to represent this number.</em>

a number increased by 10 is 114

<em>let's add 10 to our number, n + 10 </em>

a number increased by 10 is 114

<em>so, our equation equals 114. n + 10 = 114.</em>

to find n, just subtract 10 from 114.

114 - 10 = 104

so, that completes and solves your equation, hope this helps and have a great day!

laila [671]3 years ago
3 0

x+10=114

114-10=x

x=104

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n=\frac{0.5(1-0.5)}{(\frac{0.025}{2.58})^2}=2662.56  

And rounded up we have that n=2663

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".  

The population proportion have the following distribution

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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:

t_{\alpha/2}=-2.58, t_{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 0.025 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 assume an estimated proportion of \hat p =0.5 since we don't have prior info provided. And replacing into equation (b) the values from part a we got:

n=\frac{0.5(1-0.5)}{(\frac{0.025}{2.58})^2}=2662.56  

And rounded up we have that n=2663

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You do 8* 7 = 56 + 7 = 63/8
You do 4*3 = 12 + 1 = 13/4

63/8 - 13/4 = 37/8
does this help
3 0
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