Find the lateral surface area of the tissue box. 4 in 7 in. 5 in.

Distance measured in miles distance measured in yards 1 5

insens350 [35]

You can use ruler and stuff and yea

4 0

3 years ago

What is the area of rectangle abcd with 12 in length and 4 in width

nikitadnepr [17]

Answer: It would be

A=48

5 0

3 years ago

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Mr. Smith is 81 years older than his grandson, Victor. In 3 years, Mr. Smith will be four times as old as Victor. How old is Vic

puteri [66]

<h3>Answer :- </h3>

24 years

<h3>Solution :- </h3>

Let the age of victor be X .
and, the age of Mr.Smith be = 81 + x

♧ So, after 3 years = x+81 +3

81 + 3 + x = 4 ( x + 3 )
84 + x = 4x + 12

♧ now grouping the variables and constants together we get,

4x-x=84-12
3x = 72
x = 72/3
x = 24

♧ Thus, Victor's present age is 24 yrs.

Hope it helps ya ~

4 0

2 years ago

Read 2 more answers

1+1 wrong answers only

Ber [7]

Answer:

3

Step-by-step explanation:

3 0

2 years ago

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The current process has a mean of 2.50 and a std deviation of 0.05. A new process has been suggested by research. What sample si

Novay_Z [31]

Answer:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (2)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025,0,1)", and we got $z_{\alpha/2}=1.96$ , replacing into formula (2) we got:

$n=(\frac{1.96(0.05)}{0.02})^2 =24.01$

So the answer for this case would be n=25 rounded up to the nearest integer

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".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=0.05$ represent the population standard deviation

n represent the sample size (variable of interest)

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

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

And on this case we have that ME =0.02 and we are interested in order to find the value of n, if we solve n from equation (1) we got:

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (2)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025,0,1)", and we got $z_{\alpha/2}=1.96$ , replacing into formula (2) we got:

$n=(\frac{1.96(0.05)}{0.02})^2 =24.01$

So the answer for this case would be n=25 rounded up to the nearest integer

7 0

3 years ago