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Tom [10]
2 years ago
7

Divide a quantity into two parts in a given ratio.

Mathematics
1 answer:
True [87]2 years ago
3 0
You would just divide that quantity by 2.
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As a manager for an advertising company, you must plan a campaign designed to increase Twitter usage. A recent survey suggests t
kolbaska11 [484]
Given:
Sample proportion = 85% = 0.85.
Confidence level (CL) = 90%.
Confidence interval (CI) \hat{p} \pm z^{*} \sqrt{ \frac{\hat{p}(1-\hat{p})}{n} }  \\ where \\ n=sample\, size \\ z^{*}=1.645 \, at \, 90\% \, CL

We want the confidence interval to be 5% or 0.05. Therefore
0.85 - 1.645 \sqrt{ \frac{0.85(1-0.85)}{n} }=0.05 \\ 0.85 -  \frac{0.5874}{ \sqrt{n} } =0.05 \\  \frac{0.5874}{ \sqrt{n} }=0.8 \\  \sqrt{n} = .7342 \\ n=0.54

Because this number is less than 1, a default sample size of 30 (for the normal distribution) is recommended.

Answer: 30

3 0
3 years ago
The probability of drawing a quarter from a bag of coins is 4/5. What is the probability of drawing a coin that is not a quarter
elixir [45]
The sum of probability for an event happening and not happening must be equal to 1 because there is a 100% chance that one or the other will occur.

So the probability on not drawing a quarter:

P(!Q)=1-4/5

P(!Q)=5/5-4/5

P(!Q)=1/5

As a percentage:

p/100=1/5

p=100/5

p=20%
8 0
3 years ago
Please help me out !!!!
marissa [1.9K]

Answer is A) -1 because it they are parallel then they have the same slope. If the green line has a -1 slope so does the red line

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3 years ago
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The answer is 14.50. Hope that helped
4 0
3 years ago
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Estimate 856 + 457 by first rounding each number to the nearest hundred.
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Answer:

865 = 900

457 = 500

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856 + 457 = 1,313

5 0
3 years ago
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