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2 years ago

Please help...... Please....

Mathematics

2 answers:

son4ous [18]2 years ago

8 0

Answer:2

Step-by-step explanation:

riadik2000 [5.3K]2 years ago

5 0

I think it’s 2 like the person above me said

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A random variable X follows the uniform distribution with a lower limit of 670 and an upper limit of 750.a. Calculate the mean a

DENIUS [597]

You can compute both the mean and second moment directly using the density function; in this case, it's

$f_X(x)=\begin{cases}\frac1{750-670}=\frac1{80}&\text{for }670\le x\le750\\0&\text{otherwise}\end{cases}$

Then the mean (first moment) is

$E[X]=\displaystyle\int_{-\infty}^\infty x\,f_X(x)\,\mathrm dx=\frac1{80}\int_{670}^{750}x\,\mathrm dx=710$

and the second moment is

$E[X^2]=\displaystyle\int_{-\infty}^\infty x^2\,f_X(x)\,\mathrm dx=\frac1{80}\int_{670}^{750}x^2\,\mathrm dx=\frac{1,513,900}3$

The second moment is useful in finding the variance, which is given by

$V[X]=E[(X-E[X])^2]=E[X^2]-E[X]^2=\dfrac{1,513,900}3-710^2=\dfrac{1600}3$

You get the standard deviation by taking the square root of the variance, and so

$\sqrt{V[X]}=\sqrt{\dfrac{1600}3}\approx23.09$

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3 years ago

How do I convert 4/5 to a percent

Gelneren [198K]

(4/5) x 100%
= 80%
=0.8

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3 years ago

The slope of the line below is -5. Which of the following is the point-slope

dalvyx [7]

Answer:

C.y+8=5(×-2)

Step-by-step explanation:

I think it is c because when i do inke pongki,it is at c, but i dont know how to plot the graph like this, what if u can teach me

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3 years ago

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What is always true in a right triangle the altitude to the hypotenuse?

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The hypotenuse is always the biggest side of a right traingle.

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3 years ago

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Blababa [14]

$\bf ~~~~~~~~~~~~\textit{distance between 2 points} \\\\ P(\stackrel{x_1}{-4}~,~\stackrel{y_1}{-2})\qquad Q(\stackrel{x_2}{4}~,~\stackrel{y_2}{3})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ PQ=\sqrt{[4-(-4)]^2+[3-(-2)]^2}\implies PQ=\sqrt{(4+4)^2+(3+2)^2} \\\\\\ PQ = \sqrt{8^2+5^2}\implies PQ=\sqrt{64+25}\implies PQ=\sqrt{89}\implies \stackrel{\textit{rounded up}}{PQ = 9.4}$

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3 years ago

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