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3 years ago

Evaluate -125^(-1/3)

Mathematics

1 answer:

soldi70 [24.7K]3 years ago

3 0

Answer:

1/-125^(1/3)

=1/-5

=-0.2

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Answer:

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Step-by-step explanation:

The formula for calculating the minimum sample size to estimate a population mean is given by:

$n=\frac{z^{2}\sigma^{2}}{e^{2}}$

The first step is obtaining the values we're going to use to replace in the formula.

Since we want to be 95% confident, $1-\alpha=0.95 \Rightarrow \alpha=0.05$ .

Therefore we look for the critical value $z_{\alpha/2}=1.96$ .

Then we calculate the variance:

$\sigma = 3.7 \Rightarrow \sigma^{2}=13.69$

And we have that:

$e=2 \Rightarrow e^{2}=4$

Now we replace in the formula with the values we've just obtained:

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Therefore the minimum sample size that can be taken to guarantee that the sample mean is within 2 inches of the population mean is of 14 dogs.

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3 years ago

7w + (-11w) help i suck at math thank you

goldfiish [28.3K]

Answer:

-4

Step-by-step explanation:

7w + (-11w)

Postive negative negative

7w-11w

= - 4

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