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harina [27]
3 years ago
8

Pls help I'm confused on what to do. View the picture to see my question, thank you!​

Mathematics
1 answer:
slamgirl [31]3 years ago
7 0
The answer will be number 2
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X=\frac{13}{6},\:x=0
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Pooky eats three cans of cat food each day. How long will 27 cans of food last?
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The number of text messsages that teenagers send per month is normally
ki77a [65]

Answer:

z=\frac{4415-3400}{450}=2.26

And the explanation of this number is:"The number of text messages for Kendra it's 2.26 deviations above the mean"

Step-by-step explanation:

1) 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".  

2) Calculate the z score

Let X the random variable that represent the number of text messages per month, and for this case we know the distribution for X is given by:

X \sim N(3400,450)  

Where \mu=3400 and \sigma=450

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

z=\frac{4415-3400}{450}=2.26

And the explanation of this number is:"The number of text messages for Kendra it's 2.26 deviations above the mean"

6 0
3 years ago
The lines below are parallel. If the slope of the green line is -2, what is the
Andreas93 [3]

Answer:

C. -2

Step-by-step explanation:

All parallel lines have the same slope

4 0
2 years ago
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