All categories

3 years ago

Which event is certain?

Mathematics

1 answer:

-Dominant- [34]3 years ago

5 0

The sun will rise.. the sun rises everyday

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A tortoise is walking in the desert. It takes 5 minutes to walk 62.5 meters. What is its speed?

MariettaO [177]

12.5 meters a minute is the answer.

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3 years ago

Find the x and y intercepts of the line. (i dont remember how to do this.

Elden [556K]

Answer:

x-intercept: -3

y-int: 2

Step-by-step explanation:

x-intercept is the point where the line crosses the x-axis.

6 0

3 years ago

Which is a solution to the equation

Lapatulllka [165]

Hey there!

The answer is C

If you plug them all in for "y", that is the only one that works.

(There is a way to solve it, though, but it's timed so I figured I wouldn't take hours to explain, comment if you want me to explain it to you, though)

Have a good day :)

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3 years ago

Determine mu Subscript x overbar and sigma Subscript x overbar from the given parameters of the population and the sample size.

pentagon [3]

Answer:

$\bar X= \mu = 25$

$\sigma_{\bar X}= \frac{7}{\sqrt{15}}= 1.807$

Step-by-step explanation:

Previous concepts

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".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the variable of interest of a population, and for this case we know the following conditions

Where $\mu=25$ and $\sigma=7$

And for this case we select a sample size of n= 15. and we want to know the distribution for the sample mean $\bar X$ . We can assume that the distribution for $\bar X$ is approximately normal and given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

Asuming that the distribution for X is also approximately normal. So then the parameters are:

$\bar X= \mu = 25$

$\sigma_{\bar X}= \frac{7}{\sqrt{15}}= 1.807$

8 0

3 years ago

A server sees 84 customers over 6 hours. How many customers did they see in 1 hour?

AveGali [126]

Answer: 14 customers

Step-by-step explanation: Right now, you can set up an equation that looks something like this. 6h=84 (h means hours). To find the number of customers in one hour, all you have to do is isolate h on one side of the equation. To do this, just divide both sides by 6 and you should get h=14. So in one hour, this particular server sees 14 people. Hope this helps! :)

7 0

3 years ago