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natali 33 [55]
3 years ago
5

BRAINLIESSSSTTTT!!!

Mathematics
1 answer:
trapecia [35]3 years ago
6 0
A. (-5,1)
B. (-5,4)
C. (-2,4)

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For a certain online store, the distribution of number per hour is approximately normal with mean 1200 purchases and standard de
Advocard [28]

Answer: 16%

Step-by-step explanation:

When we have a normal distribution, the 100% of our sample will be placed in a "gaussian bell".

Where the middle of this bell coincides with the mean.

The mean, in this case, is 1200, and the standard deviation is 200.

In the image below you can see that between the points.

Mean + standard deviation and the end of the graph, we have:

13.5% + 2.35% + 0.15% = 16%

And particularly, if we want to know the percentage that exceed 1400, will be the same percentage above the mean plus the standard deviation.

mean = 1200

SD = 200

mean + standard deviation = 1200 + 200 = 1400.

Then the percentage that exceeds 1400 is equal to the percentage that we found above, then the correct option is C: 16%

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3 years ago
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Answer:

Step-by-step explanation:

Simplify the expression -4x^2(3x − 7).

A. -12x^3 + 28

<h2>B. -12x^3 + 28x^2<= your answer</h2>

C. -12x^3 − 28

D. -12x^3 − 28x^2

5 0
3 years ago
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I already finished it but how do you know if it’s decreasing or increasing?
nexus9112 [7]

Answer:

If the slope is positive it is increasing if the slope is negative it is decreasing :)

Example:

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Pls help I’ll brainlest pls help
Nookie1986 [14]

Answer:

67.31

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