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Aleonysh [2.5K]
3 years ago
6

Plz plz help me for math

Mathematics
1 answer:
Marysya12 [62]3 years ago
7 0

Answer:

d

Step-by-step explanation:

20% of her students are in physical science. there is actually 30% or .3 students in physical science.

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You observe a portfolio for five years and determine that its average annual return is 13% and the standard deviation of its ret
horrorfan [7]

Answer:

There is a 95% probability that the portfolio would not loose more than 30% of its value.

Step-by-step explanation:

The confidence interval for proportions (<em>p</em>) is:

CI=\hat p\pm z_{\alpha/2}\sqrt{\frac{\hat p(1-\hat p)}{n}}

The information provided is:

\hat p = 0.13\\\sqrt{\frac{\hat p(1-\hat p}{n}} =0.21

For 95% confidence level the critical value of <em>z</em> is:

z_{\alpha/2}=z_{0.05/2}=z_{0.025}=1.96

The 95% confidence interval for average annual return is:

CI=\hat p\pm z_{\alpha/2}\sqrt{\frac{\hat p(1-\hat p)}{n}}\\=0.13\pm 1.96\times0.21\\=0.13\pm 0.4116\\=(-0.2816, 0.5416)\\\approx(-28\%, 54\%)

The lower limit of the 95% confidence interval is -28%.

This implies that the portfolio would not loose more than 28% of its value.

Thus, there is a 95% probability that the portfolio would not loose more than 30% of its value.

6 0
3 years ago
Rearrange the variables to write the equation, V = 8t/p to solve for temperature, t , h, as a function of volume and pressure, v
Elodia [21]

Answer:

t = Vp / 8

Step-by-step explanation:

Given:

V = 8t/p

Where,

V = volume

t = temperature

p = pressure

solve for temperature, t as a function of volume and pressure, v and p

V = 8t/p

Cross product

V*p = 8t

Vp = 8t

Divide both sides by 8

Vp / 8 = 8t / 8

Vp / 8 = t

Therefore,

t = Vp / 8

That is, temperature = product of volume and pressure divided by 8

5 0
3 years ago
Solve the following system of eq ions. Express your answer as an ordered
daser333 [38]

Answer:

(3,2)

Step-by-step explanation:

3x + 4y=17

- 4x – 3y= - 18

Multiply the first equation by 4

4(3x + 4y=17 )

12x +16y = 68

Multiply the second equation by 3

3( - 4x – 3y= - 18)

-12x -9y = -54

Add the new equations together to eliminate x

12x +16y = 68

-12x -9y = -54

-----------------------

    7y = 14

Divide by 7

7y/7 = 14/7

y=2

Now find x

3x+4(2) = 17

3x+8 = 17

Subtract 8 from each side

3x+8-8 = 17-8

3x = 9

Divide by 3

x = 3

7 0
3 years ago
What is the value of 7(23)? Use place value and the distributive property.
kkurt [141]

Answer:

7(23) = 161

Step-by-step explanation:

Using the Distributive Property, you put the 7 into the number 23.

We have to think of place value as well. Since there is a parenthesis you have to add the 20 and 3 first.

7(23) = ?

This you are going to use the Distributive Property for.

7(23) = 161

6 0
3 years ago
Read 2 more answers
Quadrilaterals ABCD and WXYZ are congruent.
horrorfan [7]

Answer:

Only sequence A

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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