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QveST [7]
3 years ago
5

Scores on a standardized test are normally distributed with a mean of 250 and a standard a deviation of 20. Approximately what p

ercent of students scored between 260 and 280? Round to the nearest percent
Mathematics
1 answer:
masha68 [24]3 years ago
5 0

Answer:

You can't answer this properly without more data.

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A total of 560 tickets were sold
Vika [28.1K]

Answer:

I think it's 70

Step-by-step explanation:

i did 560/2 and got 280 and then divided 280 by 4 and got 70

7 0
3 years ago
t a gas station, 15 gallons of gas has a price of $17.55 and 18 gallons of gas has a price of $21.06. Write a direct variation e
yaroslaw [1]
Use  constant of variation y =kx  i.e
15 gallons k=>17.55
k gallons =17.55/15=1.17

18 gallons k=>21.06
k gallons =21.06/18=1.17

Therefore ans => y=1.17x


7 0
3 years ago
Read 2 more answers
Solve for x.<br> 3/4(8x-12)=2(4x+1)-4<br> What are the step to this equation.
aliina [53]
1. Simplify the expression
Combine like terms:
3/4(8x-12)=2(4x+1)-4
6x-9=2(4x+1)-4
6x-9=8 x-2

2. Group all X terms on the left side of the equation
Subtract 8X from both sides:
6x-9=8 x-2
(6x-9)-8x=(8x-2)-8x
-2x-9=(8x-2)-8x
-2x-9=-2

Group all constants on the right side of the equation
Add 9 to both sides of the equation:
-2x-9=-2
(-2x-9)+9=-2+9
-2x=-2+9
-2x=7

Isolate the X
Divide both sides of the equation by -2:
-2x=7
(-2x) 7
——- = —
-2 -2

X= 7
—
-2

X= -7
—
2
8 0
3 years ago
The number 17 is increased to 19. What is the percentage by which the number was increased, to the nearest tenth of a percent?
S_A_V [24]
19/17 = ?/100 19 multiplied by 100 is 1900 then divide by 17 which is 111.76..., round it = 111.8%
4 0
4 years ago
Triangle PQR has coordinates P (0, 0), Q (-4,0), and R (0, 2). If APQR - AXYZ, what is the measure of XY?
SSSSS [86.1K]

Answer:

4 units

Step-by-step explanation:

Since the two triangles are similar, their sides are proportional. To find the length of the side, you need to use the distance formula:

\sqrt{(x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2} }

The coordinates you will use are (0, 0) and (-4, 0) because they correspond to points X and Y in Triangle PQR:

\sqrt{(0 - (-4))^{2} + (0 - 0)^{2}}

Then, simplify everything under the radical:

\sqrt{16}

Finally, take the square root of 16:

\sqrt{16} = 4

4 0
3 years ago
Read 2 more answers
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