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1 year ago

This is multiplying fractions and i have to show work

Mathematics

1 answer:

grandymaker [24]1 year ago

7 0

To solve:

$\frac{2}{3}\times(-4\frac{1}{3})$

Let us convert the mixed fraction into fraction first,

$\frac{2}{3}\times(-\frac{13}{3})$

On simplification we get,

$-\frac{26}{9}$

Hence, the answer is,

$-\frac{26}{9}$

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Step-by-step explanation:

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3 years ago

Will give brainliest if correct.

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3 years ago

There are 500 seats on a plane flying to San Francisco. 20% of the seats are next to a window. How many of the seats are next to

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3 years ago

1 hour is equal to how many seconds

AURORKA [14]

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3 years ago

Read 2 more answers

The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident th

Oksana_A [137]

Answer:

The minimum sample size that should be taken is 62.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken

This is n when $M = 1, \sigma = 4$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$1 = 1.96*\frac{4}{\sqrt{n}}$

$\sqrt{n} = 4*1.96$

$(\sqrt{n})^{2} = (4*1.96)^{2}$

$n = 61.5$

The minimum sample size that should be taken is 62.

8 0

4 years ago