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2 years ago

9

The perimeter of a rectangle is 40 inches. If the length of the rectangle is 13 inches, which equation could be used to find the

width,
x?
OA. x + 13 = 40
ОВ.
2(x + 13) = 40
OC. X+2(13) = 40
OD
13(x + 2) = 40

1 answer:

Liula [17]2 years ago

4 0

Answer: OB 2(x+13) = 40

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In testing a certain kind of missile, target accuracy is measured by the average distance X at which the missile explodes. The d

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The answer is c) 761.0

Step-by-step explanation:

Mathematical hope (also known as hope, expected value, population means or simply means) expresses the average value of a random phenomenon and is denoted as E (x). Hope is the sum of the product of the probability of each event by the value of that event. It is then defined as shown in the image, Where x is the value of the event, P the probability of its occurrence, "i" the period in which said event occurs and N the total number of periods or observations.

The variance of a random variable provides an idea of the dispersion of the random variable with respect to its hope. It is then defined as shown in the image.

Then you first calculate E [x] and E [ $x^{2}$ ], and then be able to calculate the variance.

$E[x]=0*\frac{1}{40} +10*\frac{1}{20} +50*\frac{1}{10} +100*\frac{33}{40}$

$E[x]=0+\frac{1}{2} +5+\frac{165}{2}$

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So <em>E[X]²=88²=7744</em>

On the other hand

$E[x^{2} ]=0^{2} *\frac{1}{40} +10^{2} *\frac{1}{20} +50^{2} *\frac{1}{10} +100^{2} *\frac{33}{40}$

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<em>E[x²]=8505 </em>

Then the variance will be:

Var[x]=8505-7744

<u><em>Var[x]=761 </em></u>

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3 years ago