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kramer
2 years ago
8

A local concert center reports that it has been experiencing a 15% rate of no-shows on advanced reservations. Among 150 advanced

reservations, find the probability that there will be fewer than 20 no-shows. Round the standard deviation to three decimal places to work the problem.
A) 0.7967
B) 0.3187
C) 0.2451
D) 0.754
Mathematics
1 answer:
Doss [256]2 years ago
3 0

Answer: C

Step-by-step explanation:

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Find, correct to four decimal places, the length of the curve of intersection of the cylinder 16x2 + y2 = 16 and the plane x + y
Yuri [45]

Let the curve C be the intersection of the cylinder  



16x^2+y^2=16



and the plane



x+y+z=1



The projection of C on to the x-y plane is the ellipse



16x^2+y^2=16



To see clearly that this is an ellipse, le us divide through by 16, to get



\frac{x^2}{1}+ \frac{y^2}{16}=1



or  



\frac{x^2}{1^2}+ \frac{y^2}{4^2}=1,



We can write the following parametric equations,



x=cos(t), y=4sin(t)



for  



0\le t \le 2\pi



Since C lies on the plane,



x+y+z=1



it must satisfy its equation.



Let us make z the subject first,  



z=1-x-y



This implies that,



z=1-sin(t)-4cos(t)



We can now write the vector equation of C, to obtain,



r(t)=(cos(t),4sin(t),1-cos(t)-4sin(t))



The length of the curve of the intersection of the cylinder and the plane is now given by,



\int\limits^{2\pi}_0 {|r'(t)|} \, dt



But  



r'(t)=(-sin(t),4cos(t),sin(t)-4cos(t))



|r'(t)|=\sqrt{(-sin(t))^2+(4cos(t))^2+(sin(t)-4cos(t))}



\int\limits^{2\pi}_0 {\sqrt{2sin^2(t)+32cos(t)-8sin(t)cos(t)} }\, dt=24.08778184



Therefore the length of the curve of the intersection  intersection of the cylinder and the plane is 24.0878 units correct to four decimal places.

6 0
2 years ago
How do you solve this math problem
zhuklara [117]
The expressions is undefined in the set of the real numbers.
3 0
2 years ago
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Goryan [66]

Answer:

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Step-by-step explanation:

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5 0
2 years ago
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A fly trapped inside a cubical box with side length 1 meter decides to relieve its boredom by visiting each corner of the box. I
Lelu [443]

Answer:

(4 √ 3 + 4 √2 ) m

Step-by-step explanation:

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each can be calculated using Pythagoras theorem

firstly  for one face we need to calculate the diagonal

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then we calculate the diagonal opposite a corner

for example

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4 0
2 years ago
There are 520 marbles in a jar. The ratio of red to yellow marbles is 3:4 and the ratio of yellow to blue marbles is 2:3. What i
frutty [35]

Answer:

Step-by-step explanation:

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Now the ratio becomes 3:4:6

So the number of each is

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Yellow = 4*40 = 160

Blue = 6 * 40  = 240

Total =               520

7 0
2 years ago
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