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gulaghasi [49]
2 years ago
13

What is the value of the expression below? (3 x 4) - 6] + 4 x 2

Mathematics
1 answer:
Olegator [25]2 years ago
8 0
14 is your answer :)
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Three consecutive integers have a sum of 30. Which equation can be used to find x, the value of the smallest of the three number
castortr0y [4]

Answer:

X+(X+1)+X+2)=30

Step-by-step explanation:

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago
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
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