Answer:
Step-by-step explanation:
I 2
3 and 4
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach the 75th percentile? Select the closest answer
Answer:
A score of 150.25 is necessary to reach the 75th percentile.
Step-by-step explanation:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.
This means that [tex]\mu = 130, \sigma = 30[/tex]
What score is necessary to reach the 75th percentile?
This is X when Z has a pvalue of 0.75, so X when Z = 0.675.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]0.675 = \frac{X - 130}{30}[/tex]
[tex]X - 130 = 0.675*30[/tex]
[tex]X = 150.25[/tex]
A score of 150.25 is necessary to reach the 75th percentile.
Which of the following is not a real number?
А. 1
B. -4
C. 16
D. 13
B is not a real number.
Real number are numbers that are rational (1, 2, 3, -7, -10 etc) and irriational (pi, 9.7582, 1/7, etc), and can be virtually any number, aside from imaginary numbers. Square roots consist of the same number squared, for example the square root of 9, is 3 or the square root of 10 is 3.162... Both of which are real numbers.
A.) The square root of 1, is 1. 1 is a real number.
B.) The square root of -4 is imaginary. There is no real number that can be squared to get -4.
C.) The square root of 16 is 4. 4 is a real number.
D.) The square root of 13 is 3.605... 3.605... is a real number.
Thus meaning your answer is B.
I hope this helps!
Here is a list of numbers.
8 9 10 11 12 13 14
From the list write
a a multiple of 7
b a factor of 24
c a prime number
thank you! :))))
Select the correct answer.
The difference of a number and 6 is the same as 5 times the sum of the number and 2. What is the number?
А -4
B -2.
С -1
D 1
Translate the sentence into an equation. Five more than the quotient of a number and 6 is equal to 2. Use the variable w for the unknown number.
Answer:
The equation that represents the sentence is W + 6 + 5 = 2.
Step-by-step explanation:
Since it is required to propose an equation that reflects that five more than the quotient of a number and 6 is equal to 2, using the variable W for the unknown number, the following equation must be performed to determine what the unknown number is:
W + 6 + 5 = 2
W = 2 - 5 - 6
W = -9
Therefore, the unknown number is -9.
Which of these tables represents a proportional relationship between x and y choose 2 plz help ASAP
Answer:
b and c
Step-by-step explanation:
.
Please let me know the explanation of the the answer u will tell for this Question..
[tex] \huge \purple{\tt{Answer:}} [/tex]
Area of square = (length)²
[tex] = \sf {(3{\dfrac{1}{2}})^2} \\\\\ = \sf {12.25~cm^2} [/tex]
OR
[tex] \sf{12{\dfrac{1}{4}}} [/tex]
Please find the value of x
Answer: x = 118
Step-by-step explanation:
29x+2=31
Giving brainliest if do correct..
Explanation also or reported
Answer:
x = 1
Step-by-step explanation:
29x + 2 = 31
-2 -2
29x = 29
----- -----
29 29
x = 1
Pls help ..I’ll mark brainly
Answer:
D
Step-by-step explanation:
Answer:
D.33
Step-by-step explanation:
4(7)+[tex]\sqrt{-8\\ (-3)+1[/tex]
First solve inside the radical by multiplying and adding
-8 x -3=24
24+1=25
[tex]\sqrt{25[/tex]=5
Next multiply 7 x 4
28
Then add
28+5=33
I NEED THE HELP ASAP 7TH GRADE PLS
Answer:
D
Step-by-step explanation:
Use the Distributive Property to write –4(7 – 1) as an equivalent expression. What is the value of the expression?
Answer:
Step-by-step explanation:
-4(7-1) = (-4)7 + (-4)(-1) = -24
The ratio of men to women working for a company is 3 to 4. If there are 161 employees total, how many women work for the company?
The midpoint i need help
Answer:
angle WXU=56 degrees
Step-by-step explanation:
WX || TV so angle WXU is congruent to angle TVU
68-3x=84-7x
simplify by adding 7x to each side
68+4x=84
simply further by subtracting 68 from each side
4x=16
divide both sides by 4
x=4
angle WXU=68-3x
substitute for x
angle WXU=68-3(4)=68-12=56 degrees
Find the perimeter and area of the polygon shown below.
8ft
15 ft
17ft
16 ft
The perimeter and area of the polygon are 72 feet and 300 feet.
What is a polygon?"A polygon is a plane shape with straight sides. Polygons are 2 - dimensional shapes. They are made of straight lines, and the shape is closed."
From the given polygon
Perimeter of the polygon = Sum of all sides of the polygon
P = 15 + 16 + 8 + 17 + 16
P = 72 feet
Area of the polygon
A = [tex](\frac{16+16+8}{2}[/tex] × [tex]15)[/tex]
A = 20 × 15
A = 300 feet
Hence, the perimeter and area of the polygon are 72 feet and 300 feet.
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8a+11-2a make an equivalent expression!
Answer:
6a+11
Step-by-step explanation:
What is the total surface area of the square pyramid in square inches?
Height is 11 in. Base is 7 in. Side Length is 11.5
PLEASE DO THIS QUICKLY
Answer:
Step-by-step explanation:
I assume that "side length" means the slant height of one of the triangular faces.
area of a triangular face = ½(base)(side length) = ½(7)(11.5) = 40.25 in
lateral area = all four triangles = 161 in²
base area = 7² = 49 in²
total surface area = lateral area + base area = 161+49 = 210 in²
The area of the pyramid is 1.4625 ft²
What is a Square Pyramid?If the base of the pyramid is in the shape of a square (base with 4 sides), then it is called a square pyramid. As the square has 4 sides, then the square pyramid has the following properties: No. of Faces: (4+1) = 5 No.of Vertices: (4+1)= 5 No. of Edges: 2(4) = 8
Given here: The height is 11, the base is 7 in, and the side length is 11.5 inches of a pyramid.
The surface area of a square pyramid is the sum of the areas of its square base and four triangular faces:
SA = BA + (4 × FA)
=[tex]a^2+a\sqrt{a^2+4h^2}[/tex]
Where a= base length and height = h
Thus inputting the values we get
SA= 7²+7[tex]\sqrt{7^2+4.11^2}[/tex]
=49+7√533
=210.60 in²
Thus in ft.² we have 1.4625 ft²
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Help please! I will mark brainlest. Answer ASAP i have to hand in , in 8 minutes
Answer:
129 degrees
Step-by-step explanation:
So you know that AZC = 90 and CZB = 39, so all you have to do to find AZB is 90 + 39 = 129 degrees.
Multiply. Give your answer in lowest terms.
3 8
4 11
Answer:
6
11
Step-by-step explanation:
PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA POINTS*..
IM GIVING 40 POINTS !! DONT SKIP :((.
Answer:
m = -4/5
b = 7
Negative Slope
Not Proportional
Step-by-step explanation:
The diagram represents a reduction of a triangle by using a scale factor of 0.8.
Answer:
4.8 inches
Step-by-step explanation:
See comment for complete question
Represent the larger triangle with 1 and the smaller with 2.
So, we have:
[tex]H_1 =6\ in[/tex] -- height of 1
Required
Determine H2 --- Height of 2
To do this we apply dilation formula.
[tex]Original * Scale\ Factor = New[/tex]
In this case:
[tex]H_1 * Scale\ Factor = H_2[/tex]
Substitute 6 for H1 and 0.8 for Scale Factor
[tex]6* 0.8 = H_2[/tex]
[tex]4.8= H_2[/tex]
Hence, the height of the smaller triangle is 4.8 inches
Find the solution of the system of equations.
10x – 2y = 44
-2x - 9y = 10
Answer:
Merhaba, siz kanadada İngilizcem konuşuyoruz vay canına sjsjs
Answer:
10x=44+2y
x=44+2y/10.....eq(i)
-9y=10+ 2x
-Y=10+2X/9....eq(ii)
Then solve by eq(i) and eq(ii)
4 cm What is the volume of this prism? 6 cm 10 cm
Answer:
240 cm³
Step-by-step explanation:
Volume = lwh
10cm • 6cm • 4cm
10cm • 24 cm²
240 cm³
Hong bought 60 CDs that were each the same price. Including sales tax, he paid a total of $100.80. Of that total, $6.60
was tax. What was the price of each CD before tax?
Answer:
$1.57 per CD
Step-by-step explanation:
Subtract the tax from the total then divide by the number of CDs.
100.80-6.60=94.2
94.2/60=1.57
Carol had a $20 bill.
She knew her
groceries were going to
cost $16.75. She also
wanted a soda for $2.20.
How much money will she
have left after her trip to
the store?
Answer:
$16.75 + $2.20 = $18.95
$20 - $18.95 = $1.05
Step-by-step explanation:
Brainliest please
(4xy+6y-4x)-5xy-4x+3y STEP explanation pls
Answer:
this is the solution
please follow me and mark it brainliestYou are given an isosceles trapezoid ABCD with median XY. Complete the following.
AX = 8, CD = __________
I'll mark brainliest
Answer:
CD=16
Step-by-step explanation:
If XY is median then CD equals 16
Length of CD = 16 .
What is Isosceles trapezoid?An isosceles trapezoid can be defined as a trapezoid in which non-parallel sides and base angles are of the same measure.
Given,
Isosceles trapezoid ABCD with median XY.
Median cuts the non-parallel lines of trapezoid in two equal parts.
then,
AX = 8
AB = 2 × AX
AB = 2 × 8
AB = 16
ABCD is isosceles trapezoid
So, Unparallel lines are equal,
AB = CD
⇒ CD = 16 unit.
Hence, 16 unit is length of CD.
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5. Using t = 3.14, what is the circumference of a circle with a diameter of 50 units?
Round your answer to the nearest hundredth.
Answer:
1962.5
Step-by-step explanation:
The equation for the circumference of a circle is Area = pi * r squared. So if the diameter is 50, then the radius is 25. 25*25 = 625. Now we do 625 * 3.14 = 1962.5 So your answer is 1962.5 I hope this helps :)
Is it the 2nd and 3rd one? I don't entirely understand
Answer:
Statements 1, 2, or 4 each imply a rectangle. Check all three.
Step-by-step explanation:
The volume of a cylinder is 225π cm³ and its height is 9 cm.
What is the length of the cylinder's radius?
Enter your answer in the box.
cm
Answer:
5cm
Step-by-step explanation:
Given data
volume = 225π cm³
Height= 9cm
r= ???
Volume of cylinder
v=πr^2h
substitute
225π= π*r^2*9
225= r^2*9
r^2= 225/9
r^2= 25
r= √25
r= 5cm
Hence the radius is 5cm