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sweet [91]
3 years ago
12

Pls someone help me with this, and fast pls

Mathematics
1 answer:
Inga [223]3 years ago
5 0

Answer:

212.5

Step-by-step explanation:

25x17=425

425/2=212.5

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What is the variance of this data? Do not include a decimal in your answer.<br> 10, 12, 8, 2
MissTica

Answer:

10

Step-by-step explanation:

6 0
3 years ago
A researcher wants to estimate the mean age of all Business Week readers at a 99% confidence level. The standard deviation of ag
Natasha2012 [34]

Answer:

A. 60

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.99}{2} = 0.005

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

We have to find:

n when M = 3, \sigma = 9. So

M = z*\frac{\sigma}{\sqrt{n}}

3 = 2.575*\frac{9}{\sqrt{n}}

3\sqrt{n} = 9*2.575

Dividing both sides by 3

\sqrt{n} = 3*2.575

(\sqrt{n})^{2} = (3*2.575)^{2}

n = 59.68

We round up, so the correct answer is:

A. 60

5 0
4 years ago
you can buy 5 cans of green beans at the village market for $2.40. you can buy 10 of the same cans of beans at sams club for $6.
kenny6666 [7]


5 for 2.40

2.40 x 2 is 4.80 for 10 cans which is cheaper than 6.50

7 0
3 years ago
Read 2 more answers
Una empresa fabrica dos modelos de DVD: el modelo A y el modelo B. Se dispone de 50 kilogramos de caucho y de 80 horas de mano d
alexandr1967 [171]

Answer:

¿Cuántos DVD de cada tipo debe fabricar y vender para que la utilidad sea máxima?

Se debe fabricar y vender 20 DVD del modelo A y 30 DVD del modelo B. La utilidad máxima es de de S/. 1 800

Step-by-step explanation:

x : Número de DVD del modelo A

y : Número de DVD del modelo B.

                               MODELO A MODELO B TOTAL

Cantidad de caucho                  1x 1x                 50 kg.

Horas de mano de obra           1x 2x                 80 horas

U : Utilidad mensual.

La función objetivo, que se debe maximizar, es:

U=30   + 40y

x+ y \leq 50\\  

x + 2y \leq 80

x\geq 0

y\geq 0

Las coordenadas de los vértices de la región factibles son:

A (0, 0) B (50, 0) C (20, 30) D(0, 40)

Entonces, se evalúa la función objetivo en cada punto:

U (0, 0) = 30 (0) + 40 (0) = 0

U (50, 0) = 30 (50) + 40(0) = 1500

U (90, 0) = 30 (20) + 40 (30) = 1800

U (0, 40) = 30 (0) + 40 (40) =1600

Por consiguiente U tiene un valor máximo en C , en donde: x =20 ,  y = 30 .

Se debe fabricar y vender 20 DVD del modelo A y 30 DVD del modelo B. La utilidad máxima es de de S/. 1 800.

 

 30 x  40 y

 

s.a.

 



   x  0 (3)

 

  y  0 (4)

3 0
3 years ago
Find the slope of a line with these two points (-1,2) and (4,-3)
GenaCL600 [577]

Answer:

-1

Step-by-step explanation:

-3-2=-5

4-(-1)=5

-5/5 simplifies to -1

7 0
3 years ago
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