1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
topjm [15]
2 years ago
12

Should be 2/5 I'm doing the test rn

Mathematics
2 answers:
miss Akunina [59]2 years ago
6 0

Answer:

2/5

.4

40%

Step-by-step explanation:

whats the question?

xz_007 [3.2K]2 years ago
5 0

whats the question you are just saying the answer

You might be interested in
A researcher reports survey results by stating that the standard error of the mean is 25 the population standard deviation is 40
bezimeni [28]

Answer:

a) A sample of 256 was used in this survey.

b) 45.14% probability that the point estimate was within ±15 of the population mean

Step-by-step explanation:

This question is solved using the normal probability distribution and the central limit theorem.

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

a. How large was the sample used in this survey?

We have that s = 25, \sigma = 400. We want to find n, so:

s = \frac{\sigma}{\sqrt{n}}

25 = \frac{400}{\sqrt{n}}

25\sqrt{n} = 400

\sqrt{n} = \frac{400}{25}

\sqrt{n} = 16

(\sqrt{n})^2 = 16^2[tex][tex]n = 256

A sample of 256 was used in this survey.

b. What is the probability that the point estimate was within ±15 of the population mean?

15 is the bounds with want, 25 is the standard error. So

Z = 15/25 = 0.6 has a pvalue of 0.7257

Z = -15/25 = -0.6 has a pvalue of 0.2743

0.7257 - 0.2743 = 0.4514

45.14% probability that the point estimate was within ±15 of the population mean

3 0
3 years ago
PLEASE CHECK AND SEE IF I'M CORRECT!!! <br> CORRECT ANSWERS ONLY PLEASE!!!
jeka57 [31]
BD is right but PA is wrong, would be BD and MK.
5 0
2 years ago
The algebraic expression for​ "the quotient of 73 and​ x" is
lyudmila [28]

Answer

it could be 73/x

Step-by-step explanation:

3 0
3 years ago
I really need help on this question. I need to write an equation and I am very confused
ladessa [460]
Can't read it it's blurry. Sorry.
3 0
3 years ago
The World Equity Index function shown contains two valuation metrics for the S&amp;P 500. The Verizon description page contains
Nikitich [7]

Answer: Verizon is less expensive than the S&P 500 on both a P/E and dividend yield basis.

Step-by-step explanation:

When a <em>Price to Earnings ratio is relatively high</em> this means that the <em>Price of the security is high </em>because investors believe the company has good prospects.

When a Dividend Yield is relatively low, this means that the dividends being declared are quite lower than the price because Dividend yield is dividends as a percentage of security price. <em>Lower Dividend Yields therefore mean high security prices</em>.

Looking at the Verizon Chart and the S&P 500 you see that Verizon P/E ratio is 11.71 while S&P is 19.01.

This means that the price of Verizon's is less than S&P 500.

Also notice that Verizon's Dividend yield is 4.09% while S&P 500's is 1.91% again signifying that Verizon is cheaper.

I have attached the full question.

5 0
3 years ago
Other questions:
  • How do you do it please and thank you?
    12·1 answer
  • 5. Write each polynomial in standard form.<br> -X-9x² + 12
    8·1 answer
  • Christina ordered 20 pizzas. She ordered some with pepperoni and some with cheese. 50% of that pizza that we ordered had peppero
    13·1 answer
  • Whwat is 2 pwus 1 pweass hellpe itz vary hard
    10·2 answers
  • Solve x + x + 2 + 2x = -2. 1 -1 0 -2
    12·2 answers
  • Which list contains three multiples of 8?
    8·2 answers
  • A worm takes 19 seconds to travel 25 cm , How many groups of 25 cm are in 1 meter ? u guys don't need to help me but if u would
    15·1 answer
  • The scatter plot shows how much puppy weighs within a certain time period. about how much did the puppy gain during this time pe
    14·1 answer
  • PLEASE HELP ME I WILL GIVE U BRAINLEAST!!!!!
    11·1 answer
  • If m∠12 = 117° and m∠5 = 51°, find each measure.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!