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Nookie1986 [14]
3 years ago
7

I really need help on themis math!!!!!!!!!!

Mathematics
1 answer:
cluponka [151]3 years ago
7 0
Midpoint formula is M=( (x1+x²)/2 , (y1+y²)/2 )
let A be there point (x1,y1), our (2,3)

plug into the formula to get

(-2,1)=( (2+x²)/2, (3+y2)/2 )
so -2=(2+x2)/2 and 1=(3+y2)/2



x2=-6 and y2=-1
answer is B

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What was the age distribution of prehistoric Native Americans? Extensive anthropological studies in the southwestern United Stat
neonofarm [45]

Answer:

\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{1394}{88}=15.8

s^2 = \frac{88(32372) -(1394)^2}{88(88-1}=118.3

Sd(X) = \sqrt{118.273}=10.9

Step-by-step explanation:

Previous concepts

In statistics and probability analysis, the expected value "is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values".

The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).

And the standard deviation of a random variable X is just the square root of the variance.  

Solution to the problem

For this case we can calculate the properties required with the following table:

Interval     Mid point (x)     f           x*f         x^2 *f

_________________________________________

1-10               5.5               40        220         1210

11-20             15.5              15        232.5       3603.75

21-30            25.5             23       586.5       14955.75

>31                35.5             10        355          12602.5

________________________________________

Total                                 88        1394         32372

We assume that the mid point for the class >31 is 35.5 using the problem information.

For this case the expected value would be given by:

\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{1394}{88}=15.8

The variance owuld be given by this formula"

s^2 = \frac{n(\sum x^2 f) -(\sum xf)^2}{n(n-1}

And if we replace we got:

s^2 = \frac{88(32372) -(1394)^2}{88(88-1}=118.3

The standard deviation would be just the square root of the variance:

Sd(X) = \sqrt{118.273}=10.9

4 0
3 years ago
Read 2 more answers
Get it right I need this bro
s2008m [1.1K]
C because that with the that is that
6 0
2 years ago
Which property says if m= -2 then 8m = -16
Veseljchak [2.6K]

Answer:

I believe it's Division property

Step-by-step explanation:

Since 8m = -16

You divide both sides by 8. So -16 divided by 8 will equal to -2. m=-2

Hope this helpsʕ•ᴥ•ʔ

3 0
3 years ago
Please translate each algebraic expression to English phrase
ludmilkaskok [199]

1. x - 8

2. 13 + 2y

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5 0
2 years ago
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Graph the line with slope 3 passing through the point (5,-4).
12345 [234]

Answer:

y = 3x-16

Step-by-step explanation:

two points where the line goes through is (5,-4) as mentioned and (0,-16)

8 0
3 years ago
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