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qwelly [4]
3 years ago
9

A candidate for mayor wants to know how strong her support is among voters, so she posts an online survey on her campaign websit

e for voters to take. 
Is this sample of voters likely to be biased or unbiased?   A. biased   B. unbiased   To determine whether voters would be willing to vote for a tax increase to improve the city's schools, the board of education surveys 500 parents of children in the city's schools. 
Why is this sample likely to be biased?   A. The entire population of the city was not surveyed.   B. Parents of school children are too busy to be bothered with surveys.   C. There are not enough people in the sample.   D. Parents of school children are more likely to be willing to pay more to improve schools.  In a bin containing 500 marbles, 180 are red, 240 are blue, and 80 are green. In a bowl of 25 marbles scooped from this bin, how many would be expected to be green?   A. 4   B. 8   C. 9   D. 12   A battery manufacturer randomly tests 500 batteries and finds that 3 are defective. 
How many defective batteries would be expected in a shipment of 12,000 batteries?   A. 120   B. 72   C. 60   D. 36                                                                                 A large bin of mixed nuts contains peanuts, cashews, almonds, and walnuts. Sheila scoops out a bowl full of nuts and counts how many of each type she has: 17 peanuts, 9 cashews, 12 almonds, and 10 walnuts. 
Armando scoops out a bowl of 32 nuts. About how many should he expect to be cashews?   A. 5   B. 6   C. 9   D. 18
Mathematics
1 answer:
maks197457 [2]3 years ago
3 0
1) A. Biased because the population could be uneven. Too many of one ethnicity, too many of one gender, etc. 

2) I believe this one is C. because there are not enough people. You need to survey the majority of parents instead of a selected few. 

3) There are 80 green marbles per 500, therefore calculate the percentage. \frac{80}{500}=0.16 or 16 percent. Multiply 16 percent or 0.16 times 25. It gives you 4.

4) This one is a probability thing too. For every 500 batteries, there are 3 that are defective, therefore, \frac{3}{500}= 0.006. 

0.006*12000 = 72

5) Yet another one. Add up all the nuts and you get 48. The chance of getting a cashew from these 48 is: \frac{9}{48}=0.1875. 

Therefore: 0.1875*32=6
You might be interested in
Consider the quadratic function f(x)=x²-5x+12. Which statements are true about the function and its
finlep [7]

There is only one statement that is true: B. The graph of the function is a parabola.

<h3>How to study and interpret the characteristics of quadratic equations</h3>

In this question we have a <em>quadratic</em> equation, whose characteristics have to be inferred and analyzed. We need to prove each of the five choices presented in the statement:

Choice A:

If we know that x = - 10, then we evaluated it at the function:

f(- 10) = (- 10)² - 5 · (- 10) + 12

f(- 10) = 162

False

Choice B:

By analytical geometry we know that all functions of the form y = a · x² + b · x + c always represent parabolae.

True

Choice C:

The <em>quadratic</em> function opens up as its <em>leading</em> coefficient is greater that 0.

False

Choice D:

If we know that x = 20, then we evaluate it at the function:

f(20) = 20² - 5 · (20) + 12

f(20) = 312

False

Choice E:

If we know that x = 0, then we evaluate it at the function:

f(0) = 0² - 5 · (0) + 12

f(0) = 12

There is only one statement that is true: B. The graph of the function is a parabola.

To learn more on quadratic equations: brainly.com/question/1863222

#SPJ1

7 0
1 year ago
Look at the question
tamaranim1 [39]
Your answer is:

B. subtract 10 to both sides

Hope it helps
Have a great day :)
Let me know if it’s correct
5 0
3 years ago
Penelope determined the solutions of the quadratic function by completing the square. F(x) = 4x2 8x 1 –1 = 4x2 8x –1 = 4(x2 2x)
Ymorist [56]

By solving the quadratic equation using completing the square method we got that Penelope should have added 4 to both sides instead of adding 1.

<h3>What is quadratic equation ?</h3>

Any equation of the form ax^2+bx+c=0 where x is variable and a, b, and c are any real numbers where a ≠ 0 is called quadratic equation .

Given work of Penelope is

$$\begin{aligned}&f(x)=4 x^{2}+8 x+1 \\&-1=4 x^{2}+8 x \\&-1=4\left(x^{2}+2 x\right) \\&-1+1=4\left(x^{2}+2 x+1\right) \\&0=4(x+2)^{2} \\&0=(x+2)^{2} \\&0=x+2 \\&-2=x\end{aligned}$$

Now we can see that Penelope determined the solutions of the quadratic function by completing the square. so he must have been done as following

$$\begin{aligned}&f(x)=4 x^{2}+8 x+1 \\&-1=4 x^{2}+8 x \\&-1=4\left(x^{2}+2 x\right) \\&-1+4=4\left(x^{2}+2 x+1\right) \\&3=4(x+2)^{2} \\&\frac{3}{4} =x+2)^{2} \\&\frac{\pm\sqrt3}{2} =x+2 \\&\frac{-2\pm\sqrt3}{2} =x\end{aligned}$$

By solving the quadratic equation using completing the square method we got that Penelope should have added 4 to both sides instead of adding 1.

To learn more about quadratic equations visit : brainly.com/question/1214333

8 0
2 years ago
I need help please this is due in about 5 minutes
strojnjashka [21]
5x^2= 2205

Divide both sides by 5
x^2=441

Find the square root of both sides
x= 21
4 0
3 years ago
Which is bigger 5/9 or 11/20
Lina20 [59]
5/9 = 0.56
11/20 = 55/100 = 55%
So that means 5/9ths is bigger than 11/20ths 
Hope this helped, trust me i know best:)
7 0
3 years ago
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