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2 years ago

Please help me :((((

Mathematics

1 answer:

Phoenix [80]2 years ago

4 0

Answer:

Dannielle's mistake was that she added the exponents,

x^3 + 5x^3, doesn't equal 6x^6

Step-by-step explanation:

the correct work is below:

x^3 + 5x^3 + 5x^2 - 3x^2 + 2x - 7 - 1

6x^3 + 2x^2 + 2x -8

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Step-by-step explanation:

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3 years ago

Read 2 more answers

The distribution of the average amount of sleep per night gotten by college students is roughly bell-shaped with mean 412 minute

kirza4 [7]

Answer:

$P(X$

$P(z$

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 scores of a population, and for this case we know the distribution for X is given by:

$X \sim N(412,68)$

Where $\mu=412$ and $\sigma=68$

We are interested on this probability

$P(X$

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:

$P(X$

And we can find this probability using the normal standard table or excel and we got:

$P(z$

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3 years ago

Please help. there is a picture below

OleMash [197]

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2 years ago

A triangle has three different integer side lengths and a perimeter of 20 units. What is the max length of any one side?

Troyanec [42]

X + x+1 + x + 2 = 20
3x + 3 = 20
3x = 17 but can't start with x = 6 because 6+7+8 > 20,
so have start with 5 + 6 + 7 = 18 are the 3 sides.

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2 years ago

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Nataly_w [17]

Answer:

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Step-by-step explanation:

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3 years ago