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Verizon [17]
3 years ago
14

If u= 70% and o=5%, what % of scores fall within 3 standard deviations from the mean?

Mathematics
1 answer:
Ray Of Light [21]3 years ago
4 0

Answer:

"85%" is the right answer.

Step-by-step explanation:

Given:

\mu = 70 (%)

\sigma = 5 (%)

As we know,

The 99.7% observation fall within the 3rd standard deviation, then

⇒ (\mu \pm \sigma ) = (70-(3\times 5)) \ to \ (70+(3\times 5))

                =(70-15) \ to \ (70+15)

                =55 \ to \ 85 (%)

Thus the above is the correct solution.  

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Erin is making a dozen cupcakes and wants to put 3 chocolate kisses on top of each one. How many does she need?
QveST [7]

Answer:

C. 36

Step-by-step explanation:

3x12=36 :]

3 0
3 years ago
Triangle QRS is dilated according to the rule DO,2 (x,y).
Gemiola [76]

The correct options about the dilation are; Options A, B and E

<h3>How to interpret Dilated Objects?</h3>

From the given information, find attached a dilated image.

The scale factor is 2

QRS → Q'R'S' = (x,y) → 2(x,y)

The coordinates of ∆QRS are; Q (-3, 3), R (2, 4) and S (-1, 1)

To get the coordinates of Q'R'S', we would multiply each coordinate of the original triangle by the scale factor of 2 since the dilation is from the origin. In other words, each vertex of QRS is multiplied by 2 to get each of the vertex of Q'R'S'.

2(x, y) = (2x, 2y)

The coordinates of ∆Q'R'S' becomes: Q' (-6, 6), R' (4, 8), S' (-2, 2)

To determine the statements that are true about the image ΔQ'R'S,

Starting with ΔABC, we would draw the dilation image of the triangle with a center at the origin and a scale factor of 2.

A) DO, 2 (x, y) = (2x, 2y)

A dilation about the origin with a scale factor 2 is described using the above notation.

Q' = 2(-3,3) = [2(-3), 2(3)] = (-6, 6)

R' (4, 8) = 2(2,4) = [2(2), 2(4)] = (4, 8)

S' (-2, 2) = 2(-1,1) = [2(-1), 2(1)] = (-2, 2)

Thus Option A is correct.

B) Side Q'S' lies on a line with a slope of -1

Q' (-6, 6)

S' (-2, 2)

coordinate (x, y)

Slope = m = (change in y)/(change in x)

m = (6-2)/[-6-(-2)]

m = 4/(-6+2) = 4/-4

m = -1

Option B is correct

c) QR is longer than Q'R'

Length of QR (-3 to 2) = 5

Length of Q'R' (-6 to 4) = 10

QR is not longer than Q'R'

Option C is false

d) The vertices of the image are closer to the origin than those of the pre-image.

From the diagram, the vertices of the preimage are closer to the origin than those of the dilation image.

Option D is False

e) The distance from Q' to the origin is twice the distance from Q to the origin.

The distance from Q' to the origin (6 to 0) = 6

The distance from Q to the origin (3 to 0) = 3

The distance from Q' to the origin = 2(the distance from Q to the origin)

Option E is correct.

Read more about Dilated Objects at; brainly.com/question/10253650

#SPJ1

8 0
2 years ago
Plot the following points on a xy-plane.<br> (5,2) , (-2, 1) , (-1,-3)
aliya0001 [1]

Answer: See below

Step-by-step explanation:

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3 years ago
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If you know the volume of a cylinder and that a cone has the same base and height of a cone, how would you determine the volume
ratelena [41]

Answer:

Multiply the cone's volume by 3

Step-by-step explanation:

Cylinder's Volume is

V = pi r ^2(h)

Cone's Volume is

V = 1/3 pi r^2 (h)

5 0
3 years ago
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A rectangular window has a length of 81.47 cm and a width of 34.2 cm. What is the least precise measurement of the perimeter of
alexgriva [62]

Answer:

In our case the least precise is the one with no decimal units, in our case 231 cm

Step-by-step explanation:

Perimeter=2(L+w)

where;

L=length=81.47 cm

W=width=34.2 cm

Replacing;

Perimeter=2(81.47+34.2)=231.34 cm

The most precise is the one with the highest decimal units, for example 231.34 in our case the least precise is the one with no decimal units, in our case 231

8 0
4 years ago
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