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3 years ago

Help ASAP PLEASEEE Sgwhhfisbe

Mathematics

2 answers:

Vlad [161]3 years ago

6 0

Answer:

$21

Step-by-step explanation:

30% of $n = $6.30

$6.30/30% = $0.21

$0.21 * 100% = $21

LUCKY_DIMON [66]3 years ago

4 0

Answer:

$18.9

Step-by-step explanation:

Diary of a Wimpy Kid

$6.30+$6.30+$6.30=18.9 cause you are giving 30% off

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What is -2.24?

algol13

Answer: B) -2.24

Step-by-step explanation:

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2 years ago

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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

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3 years ago

A cognitive psychologist wants to investigate whether memory for a shopping list is affected by the strategy used to study the l

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Answer:

There is no sufficient evidence

Step-by-step explanation:

See attached files

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3 years ago

Find the volume to the nearest hunkeredth

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Step-by-step explanation:

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3 years ago

Interpreting the Multiplicity of a Zero:<br>Determine the multiplicity of the roots of the function

olasank [31]

For this case we have the following expression:

$k (x) = x (x + 2) ^ 3 (x + 4) ^ 2 (x-5) ^ 4\\$

The roots are:

$x = -2\\\\x = -4\\\\x = 5\\\\x = 0\\$

For example: For x = 0 we have

$k (0) = 0 (0 + 2) ^ 3 (0 + 4) ^ 2 (0-5) ^ 4\\\\k (0) = 0 (2) ^ 3 (4) ^ 2 (-5) ^ 4\\\\k (0) = 0 (8) (16) (625)\\\\k (0) = 0\\$

so it is shown that $x = 0$ is a root.

By definition, multiplicity represents the number of times a root is repeated in a polynomial, in turn it is given by the degree of the term that contains the root.

Thus:

The multiplicity of 0 is 1

The multiplicity of -2 is 3

The multiplicity of -4 is 2

The multiplicity of 5 is 4

Answer:

The multiplicity of 0 is 1

The multiplicity of -2 is 3

The multiplicity of -4 is 2

The multiplicity of 5 is 4

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3 years ago

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