if population function x has mean M(x)=2 and M(x²)=8, find its standard deviation​

Answer:

B.) No, because it fails the vertical line test.

Step-by-step explanation:

You can determine whether or not graphs represent functions by performing the vertical line test. This test states that to be a function, there must only be one output for every input. In other words, there must be only one "y" value per "x" value. As you can see, for some "x" values there is more than one "y" value.

The easiest way to perform this test is by placing your finger at the top of the graph and moving it downwards. If you cross the line twice, then it must not be a function.

B. x > 9

D. The graph has open circle.

F. The arrow to the right.

⇒ 2 < x - 7

⇒ 2 + 7 < x

⇒ 9 < x

⇒ x > 9

Here as the inequality sign is ">" it will be a open circle.

Note: "≤" and "≥" inequality signs have closed circle.

As x > 9, the arrow points will be towards right.

A group of young men decided to raise Ksh.480000 to start a business. Before actual payment was made four members pulled out and each of the remaining had to pay an additional Ksh.20000. Write an expression in terms of P for.

(a) (i) Original contribution of each member.

(ii) Contribution after withdrawal of four members.

(b) Form an equation in P and hence determine the number of initial members.

(c) Three men Kamau, James and Hassan shared Shs.480000 such that Kamau: James is 3: 2 and James: Hassan is 4: 2. Find how much each got.

The shape of the barrier is a circle with a diameter of 5 feet. The correct option is the last option - A circle with a diameter of 5 feet

From the question, we are to determine the statement that describes the shape of the barrier

From the given information,

The barrier is 2.5 feet from the tomato plant in every direction.

This can be likened to a circle that has a radius of 2.5 feet.

Recall: Radius of a circle is the distance from the center of the circle to any point on it's circumference

If radius of a circle is 2.5 feet, the diameter will be 2 × 2.5 feet = 5 feet

Hence, the shape of the barrier is a circle with a diameter of 5 feet. The correct option is the last option-  A circle with a diameter of 5 feet

Here is the complete question:

Serena constructed a wire barrier to protect her tomato plant from squirrels. The barrier is 2.5 feet from the tomato plant in every direction. Which statement describes the shape of the barrier?

A circle with a radius of 5 feet

A square with diagonals 5 feet long

A square with sides 5 feet long

A circle with a diameter of 5 feet

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( 0,0 ) is not the solution of the first inequality y≤x² +x-4 but ( 0,0) is the solution for the second inequality y <x²+2x+1.

The relation between two expressions that are not equal, employing a sign such as ≠ ‘not equal to’, > ‘greater than, or < ‘less than’

Finding the solution for the inequality is as follows:-

y ≤  x² +x-4 by putting x and y equal to 0.

0 ≤ 0 + 0 -4

0 ≤ - 4

This is incorrect so (0,0) can not be the solution for this inequality.

y < x²+2x+1.

0 < 0 + 0 + 1

0 < 1

This inequality is showing the solution for (0,0)

Therefore ( 0,0 ) is not the solution of the first inequality y≤x² +x-4 but ( 0,0) is the solution for the second inequality y <x²+2x+1.

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Answer:

  143

Step-by-step explanation:

The interval of interest extends from the mean score (71) to 2 standard deviations above the mean (71+2(6) = 83). The area under the normal distribution curve in this interval can be found using a suitable table, probability app, spreadsheet, or web site. It can also be found using the "empirical rule", which tells you that the 95% of the area is within 2 standard deviations of the mean.

__

Since the curve is symmetrical, and we're only interested in the area above the mean, the empirical rule tells us that 95%/2 = 47.5% of the sample will be in the range of interest.

  0.475 × 300 = 142.5 ≈ 143

143 students will have a score between 71 and 83.

__

The attachment shows a calculator output for the same calculation. You will notice it is slightly different from the "empirical rule," which is only an approximation. Either way, we find 143 students have scores in the range.

Answer:

tanD =4/7

Step-by-step explanation:

tanD = P/B

Where P=4 and B=7

So;

tanD=4/7

Answer:

radius = √35 mm or 5.916 mm

Explanation:

Here:

Solve for radius:

[tex]\rightarrow \sf \pi r^2 = 110[/tex]

[tex]\rightarrow \sf \dfrac{22}{7} r^2 = 110[/tex]

[tex]\rightarrow \sf r^2 = \dfrac{110(7)}{22} =35[/tex]

[tex]\rightarrow \sf r = \sqrt{35}[/tex]

Let's see

Answer:

The first one is Perimeter The second one is Area The third on is Volume.

Step-by-step explanation:

A box big enough to hold a computer is the area of something, A fence to go around the garden would be the perimeter, enough carpet to cover the floor is the volume

A fence to around a flower garden ---> perimeter

A box big enough to hold a computer ---> volume

Enough carpet to cover the floor ---> area

Distance around the outside of a shape.

The number of cubic units that make up a solid figure; the amount of space the figure occupies. In Cubic Units, or units³.

The space or surface enclosed in 2-dimensional shape.

Using these definitions, it can be said that the fence acts as a perimeter surrounding a flower garden. Each side has a length.

A box big enough enough to hold a computer is the amount of space in the box to make it big enough to hold the computer (The volume of the box).

The amount of carpet to cover the floor is acting as a 2-dimensional shape scenario as the carpet is likely a standard typical shape such as a rectangle or square. Overall, enough to occupy a standard-sized room.

Answer:

Step-by-step explanation:

That comes out, hopefully it's not failing

Answer:

176,398

It wont always be easy, but always try to do what ' s right!

   In a world of worriers, be the warrior!

        When nothing goes right, go left.

Triangle PQR is given to be a right triangle, so the Pythagorean theorem can be used to determine that RQ² + PR² = PQ².

Pythagorean theorem is a mathematical expression in Euclidean geometry that can be used to solve for any of the three (3) side lengths of a right triangle.

Mathematically, Pythagorean's theorem is given by this formula:

x² + y² = z²

Triangle PQR is given to be a right triangle, so the Pythagorean theorem can be used to determine that RQ² + PR² = PQ². It is given that  x² + y² = z² in triangle ABC, so z² = PQ² or AB = PQ.

The above information shows that the triangles are congruent because their three (3) sides are congruent. Therefore, to show that triangle PQR is a right triangle, we can use corresponding parts of the congruent triangles to show that PQ = AB, PR = AC and QR = BC.

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Answer:

You have walked 7.0 steps

Step-by-step explanation:

You just add 4 steps by 3 steps, so 4+3=7

The y-intercept of linear function (f- g)(x) is (0,9)

The table of values is given as:

x   -6 -4 -1 3 4

f(x) 15 11 5 -3 -5

g(x) -36 -26 -11 9 14

The equations of the functions is calculated using:

[tex]y = \frac{y_2 -y_1}{x_2-x_1} * (x -x_1) + y_1[/tex]

So, we have:

[tex]f(x) = \frac{11 -15}{-4 + 6} * (x + 6) + 15[/tex]

Evaluate

f(x) = -2x + 3

Also, we have:

[tex]g(x) = \frac{-26 + 36}{-4 + 6} * (x + 6) - 36[/tex]

Evaluate

g(x) = 5x - 6

Next, we calculate (f - g)(x) using:

(f - g)(x) = f(x) - g(x)

This gives

(f - g)(x) = -2x + 3 - 5x + 6

Substitute 0 for x

(f - g)(0) = -2(0) + 3 - 5(0) + 6

Evaluate

(f - g)(0) = 9

Hence, the y-intercept of (f- g)(x) is (0,9)

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Answer:

59°

Step-by-step explanation:

Well, as you can see from the figure, the line WU is a diameter which means that it is a straight line. So, Angle WSU is 180° (Because straight angles are 180°)

Also, angle WSU is formed by addition of angle VSW and VSU. The value of VSU is given in the picture. So,

∠VSW + ∠VSU = 180°

∠VSW = 180° - ∠VSU

∠VSW = 180° - 121 (Because ∠VSU is given 121°)

∠VSW = 59°

Therefore, angle VSW is 59 degrees.

So, here you go. I hope you understand my explanation. Have a good day.

- Eddie

The Dilation is 0.76

Dilation is a transformation, which is used to resize the object. Dilation is used to make the objects larger or smaller. This transformation produces an image that is the same as the original shape.

Dilation or scale factor=  Dimension of new shape/ dimension of old shape

= Perimeter of new triangle(green)/ Perimeter of old Triangle (blue)

= 8.3/10.9

= 0.76

Hence, the scale factor is 0.76.

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Answer:

3

Step-by-step explanation:

A function cannot have two y values for any value of x

answer three has two y values for x =1

Answer:

30.7 ft ladder length

Step-by-step explanation:

The ladder makes the hypotenuse of a right triangle

 31 feet   is the opposite leg of 78 degree angle

   sin 78 = opposite / hypotenuse

   sin 78 = 30/ hypot

      30 / (sin 78 ) = hypotenuse = 30.7 ft

Answer:31.7

Step-by-step explanation:

Step-by-step explanation:

Are of a circle is πr^2

to find the radius r=d/2

=12/2=6r

3.14x6x6

=169.56 cm^2

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Answer:

£280

Step-by-step explanation:

238/0.85

The function f(x) is a logarithmic function with a horizontal asymptote of y=1. The range of the function is all real numbers greater than 1, and it is decreasing on its domain of x>0. The end behavior on the LEFT side is as x approaches zero, y approaches infinity, and the end behavior on the RIGHT side is as x approaches infinity, y approaches 1.

Answer: The first and the fourth option

Step-by-step explanation:

   Every input of a function can have only one output.

   Option one is a function.

   See the attached image as to why option two is not a function.

   Option three has two outputs for the input value of "20" meaning it is not a function.

   Option four is a function.

A function assigns the value of each element of one set to the other specific element of another set. The output for the given inputs 0, 2, and 8 in the table is -3, -1, and 5, respectively.

A function assigns the value of each element of one set to the other specific element of another set.

For the given function table, the function table can be filled as,

Input (n)       Output (n − 3)

0                       (0 - 3) = -3

2                       (2 - 3) = -1

8                       (8 - 3) = 5

Hence, the output for the given inputs 0, 2, and 8 in the table is -3, -1, and 5, respectively.

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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~  ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

[tex]\textsc{heya!}[/tex]

we need to find the area of a circle with a radius of 21.

we also need a formula for this, which is

⇒ [tex]\bold{A=\pi r^2}[/tex]

the known value is r, radius, 21.

after substituting the value into the formula, we obtain:

⇒ [tex]\bold{A=\pi (21)^2}[/tex]

now we multiply the radius times itself:

⇒[tex]\bold{A=\pi *441}[/tex]

which can be written as

⇒[tex]\bold{A=441\pi}[/tex]

and finally, multiply the values

⇒ [tex]\bold{A=1385.4\;units\;^2}[/tex]

[tex]\textsc{hopefully\:helpful}[/tex]

by: [tex]\textsc{$^da_nc^in_g$}[/tex]

have a great rest of your day ahead ~ = )

Looking at the problem statement, this question states for us to determine the range of the function that is provided in a graph is.  Let us first determine what range is.

Now moving back to our problem, we can see that we have a vertex at (2, -5) and that the lowest y-values is at y = -5.  Therefore the y-values would be anything greater than or equal to -5 and less than infinity because the lines go forever up in the positive-y-direction.

Therefore, the option that would best match the description that we provided would be option B, -5 ≤ y < ∞.

Answer:

The answer is 1/2

Answer:

1/2

Step-by-step explanation:

[tex]\frac{1}{12}+\frac{5}{12} = \frac{6}{12}\\ \\ \frac{6}{12} = \frac{1}{2}[/tex]They are both equivalent fractions. If you divide the numerator and denominator both by 6, you get 1/2.

Answer:

$290.55

Step-by-step explanation:

We can use a ratio to solve

33 hours            39 hours

---------------- = -------------

245.85              x dollars

Using cross products

33 * x = 39* 245.85

33x=9588.15

Divide each side by 33

33x/33 = 9588.15-33

x =290.55