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GuDViN [60]
3 years ago
10

A catalog sales company promises to deliver orders placed on the Internet within 3 days.​ Follow-up calls to a few randomly sele

cted customers show that a​ 95% confidence interval for the proportion of all orders that arrive on time is 70​%±88​%.
A. What does this​ mean? For each​ conclusion, state whether it is correct or not and explain why. Complete parts a through e below. ​
B. Between 62​% and 78​% of all orders arrive on time. State whether the conclusion is correct or not and explain why. Choose the correct answer below.
Mathematics
1 answer:
Tju [1.3M]3 years ago
3 0

Answer:B. Between 62​% and 78​% of all orders arrive on time. State whether the conclusion is correct or not and explain why. Choose the correct answer below.

Step-by-step explanation:

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What are the zeros of the function f(x) = x2 + 5x + 5 written in simplest radical form? Quadratic formula: x = StartFraction neg
Harman [31]

Answer:

x=\frac{-5(+/-)\sqrt{5}} {2}

x = StartFraction negative 5 plus or minus StartRoot 5 EndRoot Over 2 EndFraction

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}

in this problem we have

f(x)=x^{2} +5x+5  

equate the function to zero

x^{2} +5x+5=0  

so

a=1\\b=5\\c=5

substitute in the formula

x=\frac{-5(+/-)\sqrt{5^{2}-4(1)(5)}} {2(1)}

x=\frac{-5(+/-)\sqrt{5}} {2}

therefore

x = StartFraction negative 5 plus or minus StartRoot 5 EndRoot Over 2 EndFraction

6 0
3 years ago
Read 2 more answers
A police officer seals off the scene of an accident using a roll of yellow tape that is 272 feet long. What dimensions should be
klasskru [66]

Answer:

  68 feet square

Step-by-step explanation:

The rectangle with the maximum area for a given perimeter is a square. The perimeter of a square is 4 times the side length, so the side length of the square area will be ...

  (272 ft)/4 = 68 ft

_____

<em>More formally ...</em>

You can let x represent the length of one side. Then the length of the other side for the given perimeter will be 136 -x, and the area will be the product ...

  area = x(136 -x)

The area function is a quadratic with zeros at x=0 and x=136. The vertex (maximum area) will be at the value of x that is on the line of symmetry between these points, at their midpoint: x = (0 +136)/2 = 68. This value of x makes the rectangle a square.

5 0
3 years ago
What force is needed to give a 4.5-kg bowling ball an acceleration of 9 m/s2? Use the formula F=ma A) 0.5 N B) 2 N C) 40.5 N D)
zubka84 [21]
If, "F" = 'ma'.
then↓
                         
                     4.5(9) = 40.5 

So, that means 40.5 is the answer for this question 

:) 


4 0
3 years ago
Which equation represents: "Four times an unknown integer, multiplied by three times the unknown integer plus a different unknow
olga_2 [115]
This is assuming that the question laid out the sequence of a calculation.

4y x 3y + z = 100
12y^2 + z = 100
3 0
3 years ago
Help as soon as possible​
Rainbow [258]
Your answer ti this is B
3 0
2 years ago
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