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Mathematics

1 answer:

nata0808 [166]2 years ago

4 0

Answer:

I believe it would be 4 seconds

Step-by-step explanation:

PLATO/Edmentum

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3 years ago

Which measure is equivalent to 25,200 seconds? 1 min = 60 s 1 h = 60 min

sertanlavr [38]

Solution:

Note that:

1 min = 60 sec
1 h = 60 min.

The given time is in seconds. Convert it into minutes by dividing it by 60.

=> 25,200 seconds = 25,200 ÷ 60 minutes = 420 minutes

The obtained time is in minutes. Convert it into hours by dividing it by 60.

=> 420 minutes = 420 ÷ 60 hours = 7 hours

We can conclude that:

25,200 seconds = 420 minutes = 7 hours

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2 years ago

Read 2 more answers

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: