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tamaranim1 [39]
3 years ago
12

Sarah bought a TV for $250. Three years later she sold it for $180. Work out her percentage loss.

Mathematics
1 answer:
Anna71 [15]3 years ago
3 0
70/250 x 100
Answer: 28%
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Construct the confidence interval for the population standard deviation for the given values. Round your answers to one decimal
Alex777 [14]

Answer:

The correct answer is "2.633< \sigma < 4.480".

Step-by-step explanation:

Given:

n = 21

s = 3.3

c = 0.9

now,

df = n-1

    =20

⇒ x^2_{\frac{\alpha}{2}, n-1 } = x^2_{\frac{0.9}{2}, 21-1 }

                  = 31.410

⇒ x^2_{1-\frac{\alpha}{2}, n-1 } = 10.851

hence,

The 90% Confidence interval will be:

= \sqrt{\frac{(n-1)s^2}{x^2_{\frac{\alpha}{2}, n-1 }} } < \sigma < \sqrt{\frac{(n-1)s^2}{x^2_{1-\frac{\alpha}{2}, n-1 }}

= \sqrt{\frac{(21-1)3.3^2}{31.410} } < \sigma < \sqrt{\frac{(21.1)3.3^2}{10.851} }

= \sqrt{\frac{20\times 3.3^2}{31.410} } < \sigma < \sqrt{\frac{20\times 3.3^2}{10.851} }

= 2.633< \sigma < 4.480

4 0
2 years ago
Find the area of the shape above ?
Juli2301 [7.4K]

Area of triangle = <em>A(t) </em>= 1/2(base x height)

Area of square = <em>A(s) = </em>base x height

<em>A(s) </em>= 2 x 2 = 4

<em>2(A(s))</em> = 2(1/2(2)(2) = 2(1/2(4)) = 2(2) = 4

Add the two areas together

4 + 4 = 8

8 units² is your answer

4 0
3 years ago
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Solve x2 - x - 5/2 = 0 using the quadratic formula.
stich3 [128]

Answer:

x= 1±\sqrt{11} over 2

6 0
3 years ago
How many cubes are needed to build this structure?
Elena-2011 [213]
Hello!

I believe that 8 cubes are needed to build the given figure

I hope this helps!
6 0
2 years ago
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BRAINLIEST PLEASE ANSWER FAST What is 12.5% written as a decimal? 0.00125 0.125 1.25 12.5
r-ruslan [8.4K]
Your answer is .125.
4 0
2 years ago
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