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3 years ago

Can someone help me with this ASAP please I’m being timed !

Mathematics

1 answer:

Alecsey [184]3 years ago

3 0

The picture is kind of blurry... but based on what I see the answer is the first one.

Hope this helps!

Let me know if you need anymore help.

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. A local electricians union has 540 members. If 65% of the members attended the last meeting, how many members went to the last

Genrish500 [490]

351 members

Multiply .65 by 540 which gives you 351.

8 0

2 years ago

The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first deter

VMariaS [17]

Answer:

He must survey 123 adults.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Assume that a recent survey suggests that about 87% of adults have heard of the brand.

This means that $\pi = 0.87$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a p-value of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

How many adults must he survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage?

This is n for which M = 0.05. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.05 = 1.645\sqrt{\frac{0.87*0.13}{n}}$

$0.05\sqrt{n} = 1.645\sqrt{0.87*0.13}$

$\sqrt{n} = \frac{1.645\sqrt{0.87*0.13}}{0.05}$

$(\sqrt{n})^2 = (\frac{1.645\sqrt{0.87*0.13}}{0.05})^2$

$n = 122.4$

Rounding up:

He must survey 123 adults.

6 0

3 years ago

10x+9-40.<br> How you do this

emmainna [20.7K]

Answer:

10x−31

Step-by-step explanation:

Let's simplify step-by-step.

10x+9−40

=10x+9+−40

Combine Like Terms:

=10x+9+−40

=(10x)+(9+−40)

=10x−31

Hope this helps and can you please give me brainliest ;-)

3 0

3 years ago

What are the answers for these questions 1,2,&3

ValentinkaMS [17]

1fyjoite yuuic hyrsd hui

6 0

3 years ago

You have been asked to create a sign for Sonic and have been given a 4 in by 6 in logo to enlarge. Your boss told you to make su

sdas [7]

Dimensions of the logo:
W = 4 in, L = 6 in
Dimensions of the billboard:
W ( Billboard ) = 4 x 15/2 = 2 x 15 = 30 in
L ( Billboard ) = 6 x 15/2 = 3 x 15 = 45 in
Answer:
D ) 30 in by 45 in

6 0

3 years ago