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Inga [223]
3 years ago
13

A device contains two circuits. The second circuit is a backup for the first, so the second is used only when the first has fail

ed. The device fails when and only when the second circuit fails. Let X and Y be the times at which the first and second circuits fail, respectively. X and Y have joint probability density function
f(x,y) = { 6e^-x e^-2y for 0 < x < y < .

What is the expected time at which the device fails?
Mathematics
1 answer:
Alecsey [184]3 years ago
4 0

Answer:

Do you have a photo of this problem

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PERMUTATION:
horsena [70]

Answer:

28

Step-by-step explanation:

It can be a one digit no.

_

2C1 = 2 (only two even options available)

It can be a 2 digit no.

_ _

The last digit has to be even for the no. to be even.

2C1 × 4C1 = 8 (2C1 for the last digit, 4C1 for the first)

It can be a 3 digit no.

_ _ _

First digit has to be less than 5 to be less than 500, and the last digit has to be even.

1) 2/4 _ 4

2C1 × 3C1 = 6 (2C1 to choose between 2 and 4, 3C1 for the second digit)

2) 1/3 _ 2/4

2C1 × 3C1 × 2C1 = 12 (2C1 to choose between 1 and 3, 3C1 for the second digit, 2C1 to choose between 2 and 4)

Total = 2 + 8 + (6 + 12)

= 28

5 0
4 years ago
A trapezoid’s top measures 2.2 m, and its height measures 4.0 m. Calculate the measurement of the base if the area of the trapez
Ghella [55]

Answer:

The measurement of the other parallel side which is the base of the parallelogram is 4.3 m

Step-by-step explanation:

Mathematically, the area of a trapezoid can be calculated using the formula below;

A = 1/2 (a + b) c

where a and b are the parallel sides and c is the height

We have one parallel sides and the height including the value of the area

Let’s say A = 13

a = 2.2m

h = 4.0 m

Plugging these values, we have;

13 = 1/2(a + 2.2) 4

26 = 4(a + 2.2)

26 = 4a + 8.8

26-8.8 = 4a

4a = 17.2

a = 17.2/4

a = 4.3 m

7 0
3 years ago
WILL MARK BRAINLIEST <br><br> What is the value of x? <br><br> 10 <br> 15 <br> 30 <br> 45
zhannawk [14.2K]
The answer is 15 but I don't think that's right so sorry if it's wrong
6 0
3 years ago
Read 2 more answers
Can anyone help me do this equation?
lilavasa [31]

The solution to the given equation is x > 5.3

<h3>Solving linear inequality</h3>

Inequality are expression that are separated by an equal sign.

Given the inequality;

16(1/4 x - 1/2) > 24-  2x

Expand

4x - 8 > 24 -2x

Collect like terms

4x + 2x > 24 + 8

6x > 32

x > 32/6

x > 5.3

Hence the solution to the given equation is x > 5.3

Learn more on inequality here: brainly.com/question/24372553

#SPJ1

7 0
2 years ago
Simple question plz help.. 20 points. SHOW WORK/EXPLAIN
Y_Kistochka [10]

Answer:The answer are the red card(The second), A dependent event is an event that relies on another event to happen first.

Since he keep his first took red card,his probability to get another red card became lower,therefore it effects on what card he will take next.

the third one doesn't called a dependent event because it's a Dice,so the probability still the same

The fourth one doesn't count to,since he return back the marble.

3 0
3 years ago
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