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Allisa [31]
3 years ago
14

Could someone explain this better?

Mathematics
1 answer:
madam [21]3 years ago
7 0

Step-by-step explanation:

First, they want you to draw an arc centered at the vertex A.  It will intersect the lines at two points.  One point is B and the other is C.

Next, they want you to draw two more arcs, one at B and one at C.  The two arcs must have the same radius.  They intersect at point X.

Draw a line from A to X.  That's the angle bisector.

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A forester studying the effects of fertilization on certain pine forests in the Southeast is interested in estimating the averag
ahrayia [7]

Answer:

P(-2 \leq \bar X -\mu \leq 2)

If we divide both sides by \frac{\sigma}{\sqrt{n}} we got:

P(\frac{-2}{\frac{4}{\sqrt{9}}}\leq Z \leq \frac{2}{\frac{4}{\sqrt{9}}})

And we can use the normal distribution table or excel to find the probabilites and we got:

P(-1.5 \leq Z \leq 1.5)= P(ZStep-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 area of a population, and for this case we know the distribution for X is given by:

X \sim N(M,4)  

Where \mu=M and \sigma=4

We select a a sample of n =4 and since the distribution for X is normal then we know that the distribution for the sample mean \bar X is given by:

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

And we want to find this probability:

P(-2 \leq \bar X -\mu \leq 2)

If we divide both sides by \frac{\sigma}{\sqrt{n}} we got:

P(\frac{-2}{\frac{4}{\sqrt{9}}}\leq Z \leq \frac{2}{\frac{4}{\sqrt{9}}})

And we can use the normal distribution table or excel to find the probabilites and we got:

P(-1.5 \leq Z \leq 1.5)= P(Z

8 0
3 years ago
7-10/2<br> 2<br> -13<br> 12<br> -1.5
Luden [163]

Answer:

=14

Step-by-step explanation:

3 0
3 years ago
Factor the polynomial completely 20x -220x squared + 600x
denis23 [38]
I first would rearrange the problem

-220x^2 + 20x + 600x

Simplify

-220x^2 + 620x

Find the GCF of the two values

20x(11x + 13)

Hope this helps!
7 0
2 years ago
Maths question pls answer
Vitek1552 [10]

Answer:

81

Step-by-step explanation:

We need to know the sides of the square so 36÷4=9

Area of a square = Side x side

Area of square = 9x9=81

3 0
2 years ago
Read 2 more answers
Use the equation n2 + n = 56 to determine which figure has 56 blocks.
Snezhnost [94]

Answer:

7

Step-by-step explanation:

it is the 7th figure

6 0
3 years ago
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