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Mandarinka [93]
3 years ago
15

Catherine finds that in a randomly selected sample of 500 families in her home town, 45% own at least one computer. Her research

shows that there are a total of 35,000 families in her town.
Which statements are true?

Select each correct answer.

A)Since her sample was only 500 families, it is not possible that the percentage is a good estimate for the percentage of all 35,000 families that own a computer.
B) If she collected data for a random sample of 1000 families in her home town, then that percentage would be a better estimate for the percentage of all 35,000 families that own a computer.
C)Since her sample was randomly selected, she can reasonably infer that about 45% of the 35,000 families in her town own at least one computer.
D)To estimate the percentage well, she would need to collect data for all 35,000 families.
Mathematics
2 answers:
Lorico [155]3 years ago
8 0

Answer:

The Answer is B and D

Step-by-step explanation:

I took the quiz and got it right

klemol [59]3 years ago
4 0
It's B because she would have a better chance of being accurate if she did 1000 families
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Haley has enlarged a 3-inch by 5-inch picture so that both the length and width are tripled. The area of the enlarged photo is h
77julia77 [94]

Answer:

9 times

Step-by-step explanation:

Area = length x breadth

area of picture not enlarged = 3 x 5 = 15in²

If length is tripled it becomes , 3 x 3 = 9in

If width is tripled, it becomes , 5 x 3 = 15in

Area of enlarged picture = 9in x 15in = 135in²

amount by which enlarged image is larger = 135in² /15in² = 9

5 0
2 years ago
Which Inequality reflects the verbal sentence: "The sum of a and b is at most 50!"
aev [14]
A+b is less than or equal to 50
6 0
3 years ago
Consider the graph of the sixth-degree polynomial function f.
vekshin1

Answer:

b = 1, c = -1 and d = 4

Step-by-step explanation:

To solve this question the rule of multiplicity of a polynomial is to be followed.

If the multiplicity of a polynomial is even at a point, graph of the polynomial will touch the x-axis.

If the multiplicity of the polynomial is odd, graph will cross the x-axis at that point.

From the graph of function 'f',

f(x) = (x - b)(x - c)²(x - d)³

Since, graph of the function 'f' crosses x-axis at x = 1 and x = 4, multiplicity will be odd and touches the x-axis at x = -1 multiplicity will be even.

So the function will be,

f(x) = (x - 1)[x - (-1)]²(x - 4)³

Therefore, b = 1, c = -1 and d = 4 will be the answer.

7 0
2 years ago
Read 2 more answers
You place three orders for 100 soccer balls which cost $22 per ball. You receive all 300 balls. There is a delivery charge of $2
julsineya [31]

Answer:

Average cost per ball: $22.2

Step-by-step explanation:

Cost per ball: $22

Cost of 300 balls: 300 × 22 = $6600

Total No. of Orders: 3

Delivery fee per order: $20

Total Delievery fee: 20 × 3 =$60

Total cost including delivery cost: $6600 + $60 = $6660


Average cost per ball = \frac{Total cost}{No. of balls}

Average cost per ball = \frac{6660}{300}

Average cost per ball = $22.2



7 0
3 years ago
From the top of a building, the angle of elevation to the top of a nearby building is 28° and the angle of depressions to the bo
kicyunya [14]

Answer:

Step-by-step explanation:

The idea here is to find the value for x and y, then add them together. See the pic I attached below. We will solve for side x first.

Side s is across from the reference angle of 48 degrees; side measuring 50 m is adjacent to the reference angle 48 degrees. Therefore, we will use the tangent ratio to solve for x:

tan48=\frac{x}{50} and

50tan(48) = x so

x = 55.53m

Now we will do the same and solve for y. This time the reference angle is 28 degrees. Side y is opposite the reference angle and the side measuring 50 is adjacent to the reference angle, so we will use the tangent ratio again:

tan28=\frac{y}{50} and

50tan(28) = y so

y = 26.59. Therefore,

x + y = 55.53 + 26.59 and

the height of the taller building is

82.1 m

6 0
3 years ago
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