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
Ulleksa [173]
3 years ago
6

What is the value of x to the nearest tenth? gradpoint

Mathematics
1 answer:
Mnenie [13.5K]3 years ago
6 0

Answer:

5

Step-by-step explanation:

You might be interested in
While researching the cost of school lunches per week across the state, you use a sample size of 45 weekly lunch prices. The sta
Drupady [299]

We assume the lunch prices we observe are drawn from a normal distribution with true mean \mu and standard deviation 0.68 in dollars.


We average n=45 samples to get \bar{x}.


The standard deviation of the average (an experiment where we collect 45 samples and average them) is the square root of n times smaller than than the standard deviation of the individual samples. We'll write


\sigma = 0.68 / \sqrt{45} = 0.101


Our goal is to come up with a confidence interval (a,b) that we can be 90% sure contains \mu.


Our interval takes the form of ( \bar{x} - z \sigma, \bar{x} + z \sigma ) as \bar{x} is our best guess at the middle of the interval. We have to find the z that gives us 90% of the area of the bell in the "middle".


Since we're given the standard deviation of the true distribution we don't need a t distribution or anything like that. n=45 is big enough (more than 30 or so) that we can substitute the normal distribution for the t distribution anyway.


Usually the questioner is nice enough to ask for a 95% confidence interval, which by the 68-95-99.7 rule is plus or minus two sigma. Here it's a bit less; we have to look it up.


With the right table or computer we find z that corresponds to a probability p=.90 the integral of the unit normal from -z to z. Unfortunately these tables come in various flavors and we have to convert the probability to suit. Sometimes that's a one sided probability from zero to z. That would be an area aka probability of 0.45 from 0 to z (the "body") or a probability of 0.05 from z to infinity (the "tail"). Often the table is the integral of the bell from -infinity to positive z, so we'd have to find p=0.95 in that table. We know that the answer would be z=2 if our original p had been 95% so we expect a number a bit less than 2, a smaller number of standard deviations to include a bit less of the probability.


We find z=1.65 in the typical table has p=.95 from -infinity to z. So our 90% confidence interval is


( \bar{x} - 1.65 (.101),  \bar{x} + 1.65 (.101) )


in other words a margin of error of


\pm 1.65(.101) = \pm 0.167 dollars


That's around plus or minus 17 cents.




3 0
3 years ago
Read 2 more answers
Price of a mobile phone including 10% GST is rs.16,600. Find the p[rice of mobile phone before gst was added
Nimfa-mama [501]

Answer:

16,600 = 110%, you can do this in your head minus 1,660 GST (whatever that is) 14,940

Step-by-step explanation:

6 0
3 years ago
What is the next term in the following sequence?
enot [183]
-2
Explanation:
You divide by -3each time
54/-3 = -18
-18/-3 = 6
6/-3 = -2
7 0
3 years ago
The world's population is expected to grow at a rate of 1.3% per year until at least the year 2020. In 1994 the total population
Marina CMI [18]
The solution to your problem is as follows:

Given: 
P₀ = 5,642×10^6 people, 
i = 1.3% = 0.013 per year, 
n = 2020 - 1994 = 26 years, 

We get: 
<span>
Pn = P₀ e^(i.n) </span>
. . .= 5,642×10^6×e^(0.013×26) 
<span>. . .= 7,911×10^6 people

Therefore, the </span>the world's predicted population in the year 2020 is <span>7,911×10^6 people.


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!</span>
5 0
3 years ago
Which of the following would you use to estimate how much lemonade pitcher can hold
Y_Kistochka [10]

Could depend on many things, but i believe it would be ounce.

4 0
3 years ago
Read 2 more answers
Other questions:
  • Francisco’s game involves a bag of 3 green, 2 yellow, 4 red, and 3 black marbles. Andrew wants to increase the likelihood of sel
    9·2 answers
  • What is the answer of this problem if mr.reyes gave his daughter P250 on her 18th birthday and intends to increase this by P150
    9·2 answers
  • A game at a county fair has a spinning drum holding 15 colored plastic balls: some white, some green, and some red. Every time t
    11·2 answers
  • Which of the following is a solution of y - x &gt; -3?
    13·1 answer
  • How do you know what number to multiply everything by using the elimination method on systems of equations??
    12·1 answer
  • Which number value would complete the table below?
    5·2 answers
  • What is the slope of the line given by the equation 2x+3y=6
    11·1 answer
  • Which equations are equivalent to -1/4(x)+3/4=12? Select all that apply.
    7·2 answers
  • In a family 3 adults and 2 children visit a play park for a total cost of $1100 and 2 adults and 3 children from another family
    7·1 answer
  • Translate 9 times the sum of n and 12 to symbols
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!