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Misha Larkins [42]
3 years ago
7

The price of an mp3 player is reduced to three-fourths of its original price. The new price is $75. What is the the original pri

ce of the MP3 player ?
Mathematics
1 answer:
elena55 [62]3 years ago
7 0

Answer:

idk

Step-by-step explanation:

i just want the points my dood

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A recent study asked U. S. Adults to name 10 historic events that occurred during their lifetime that have had the greatest impa
Nadusha1986 [10]

Using the z-distribution, as we are working with a proportion, it is found that the 99% confidence interval for the proportion of all U. S. Adults who would include the 9/11 attacks on their list of 10 historic events is (0.7458, 0.7942). It means that we are 99% sure that the true proportion for all U.S. adults is between these two bounds.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

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

In which:

  • \pi is the sample proportion.
  • z is the critical value.
  • n is the sample size.

In this problem, the parameters are:

z = 2.575, n = 2000, \pi = 0.77

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.77 - 2.575\sqrt{\frac{0.77(0.23)}{2000}} = 0.7458

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.77 + 2.575\sqrt{\frac{0.77(0.23)}{2000}} = 0.7942

The 99% confidence interval for the proportion of all U. S. Adults who would include the 9/11 attacks on their list of 10 historic events is (0.7458, 0.7942). It means that we are 99% sure that the true proportion for all U.S. adults is between these two bounds.

More can be learned about the z-distribution at brainly.com/question/25890103

7 0
2 years ago
Given the parent function f(x) = x give the best description of the graph of y = x3 +3.
oee [108]

Answer: A

Step-by-step explanation:

just took it

6 0
3 years ago
PLEASEEEE HURRY
nika2105 [10]

Answer:

22

Step-by-step explanation:

The y values increase by 2 every time so 18+2=22

8 0
3 years ago
Question 17, 19 and 21 ?
Vaselesa [24]
If this is Textbook work- use SLADER (the app or the website)
3 0
3 years ago
Is this correct btw I put 1400​
Oxana [17]

Answer: Yes

Step-by-step explanation: The answer of 1400 is correct.

What I did is I found the area of the figure assuming it was a rectangle, then I subtracted the corners that were removed.

1800 - 150 - 100 - 150 = 1400

5 0
3 years ago
Read 2 more answers
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