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Veseljchak [2.6K]
3 years ago
5

Suppose that the logons to a computer network follow a Poisson process with an average of 3 logons per minute. (a) What is the m

ean time between logons (in minutes)
Mathematics
1 answer:
Fynjy0 [20]3 years ago
5 0

Answer:

The mean time between logons is of 0.3333 minutes.

Step-by-step explanation:

Poisson process with an average of 3 logons per minute.

This means that the time between logons follows an exponential distribution, which mean is given by:

E(X) = \frac{1}{\lambda}

For this question, we have that \lambda = 3, and thus:

E(X) = \frac{1}{\lambda} = \frac{1}{3} = 0.3333

The mean time between logons is of 0.3333 minutes.

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If a=i+7j+k and b=i+11j+k, find a unit vector with positive first coordinate orthogonal to both a and
Scilla [17]
Take the cross product, then normalize the result.

\mathbf a\times\mathbf b=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\1&7&1\\1&11&1\end{vmatrix}=-4\,\mathbf i+4\,\mathbf k

This has norm

\|\mathbf a\times\mathbf b\|=\sqrt{(-4)^2+4^2}=4\sqrt2

and so a unit vector orthogonal to both given vectors is

\dfrac{\mathbf a\times\mathbf b}{\|\mathbf a\times\mathbf b\|}=-\dfrac1{\sqrt2}\,\mathbf i+\dfrac1{\sqrt2}\,\mathbf k

An equally correct answer would be the negative of this vector, since \mathbf b\times\mathbf a=-\mathbf a\times\mathbf b.
5 0
3 years ago
Which of these is the best reason to carry out scientific research on environmental issues?
julia-pushkina [17]

Answer:

The correct option is B) To help people prepare for the future.

Step-by-step explanation:

The other three options are irrelevant to scientific research on environment .

Hence the correct option is B)

4 0
3 years ago
Daniel borrowed $8,000 at 6% interest for 10 years. What was the total interest?   A. $48,000   B. $4,800   C. $480   D. $48
Mariulka [41]
I think it wold be b

please tell me if i wrong
4 0
3 years ago
Can someone please help me with this trigonometry problem. I would highly appreciate it if you did​
dexar [7]

Answer:

x ≈ 16.52

Step-by-step explanation:

Use the tangent ratio in the right triangle to find x

tan36° = \frac{opposite}{adjacent} = \frac{12}{x}

Multiply both sides by x

x × tan36° = 12 ( divide both sides by tan36° )

x = 12 / tan36° ≈ 16.52 ( to 2 dec. places )

5 0
3 years ago
A tree initially measured 3812 feet tall. Over the next 512 years, it grew to a final height of 4912 feet. During those 512 year
Arlecino [84]

Answer:

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Step-by-step explanation:

I think you meant 38 1/2

and 5 1/2

but if you didn't then its

2.1484375

because

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1100÷512= 2.1484375

3 0
3 years ago
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