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
SVEN [57.7K]
3 years ago
14

Please help right nkw

Mathematics
2 answers:
Naddika [18.5K]3 years ago
6 0
Hsjzhdhxjdvffbzbdjdbdjdjd
Ipatiy [6.2K]3 years ago
5 0

What's the question you need help on?

You might be interested in
What is the answer of 6xy + (-9xy)
kati45 [8]

Answer:

-3xy

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
(-5• -4) divided by (-3+5)
Zepler [3.9K]

Answer:

15/1 (15 Over 1)

Step-by-step explanation:

8 0
3 years ago
This is the second time I've posted it: I need help on a math problem and it's due in a few hours. Could someone please help me
emmasim [6.3K]

Answer:

Step-by-step explanation:

inland city has the coldest winter and warmest summer.

inland city, since it has a higher median of around 14.5 Celsius while coastal city has around 14 degrees Celsius

I would prefer to live in coastal city, since it has a smaller range of temperatures. Also, it has nice and mild weather: it has warmer winters than inland city, and cooler summers than inland city.

4 0
3 years ago
Let X denote the length of human pregnancies from conception to birth, where X has a normal distribution with mean of 264 days a
Kaylis [27]

Answer:

Step-by-step explanation:

Hello!

X: length of human pregnancies from conception to birth.

X~N(μ;σ²)

μ= 264 day

σ= 16 day

If the variable of interest has a normal distribution, it's the sample mean, that it is also a variable on its own, has a normal distribution with parameters:

X[bar] ~N(μ;σ²/n)

When calculating a probability of a value of "X" happening it corresponds to use the standard normal: Z= (X[bar]-μ)/σ

When calculating the probability of the sample mean taking a given value, the variance is divided by the sample size. The standard normal distribution to use is Z= (X[bar]-μ)/(σ/√n)

a. You need to calculate the probability that the sample mean will be less than 260 for a random sample of 15 women.

P(X[bar]<260)= P(Z<(260-264)/(16/√15))= P(Z<-0.97)= 0.16602

b. P(X[bar]>b)= 0.05

You need to find the value of X[bar] that has above it 5% of the distribution and 95% below.

P(X[bar]≤b)= 0.95

P(Z≤(b-μ)/(σ/√n))= 0.95

The value of Z that accumulates 0.95 of probability is Z= 1.648

Now we reverse the standardization to reach the value of pregnancy length:

1.648= (b-264)/(16/√15)

1.648*(16/√15)= b-264

b= [1.648*(16/√15)]+264

b= 270.81 days

c. Now the sample taken is of 7 women and you need to calculate the probability of the sample mean of the length of pregnancy lies between 1800 and 1900 days.

Symbolically:

P(1800≤X[bar]≤1900) = P(X[bar]≤1900) - P(X[bar]≤1800)

P(Z≤(1900-264)/(16/√7)) - P(Z≤(1800-264)/(16/√7))

P(Z≤270.53) - P(Z≤253.99)= 1 - 1 = 0

d. P(X[bar]>270)= 0.1151

P(Z>(270-264)/(16/√n))= 0.1151

P(Z≤(270-264)/(16/√n))= 1 - 0.1151

P(Z≤6/(16/√n))= 0.8849

With the information of the cumulated probability you can reach the value of Z and clear the sample size needed:

P(Z≤1.200)= 0.8849

Z= \frac{X[bar]-Mu}{Sigma/\sqrt{n} }

Z*(Sigma/\sqrt{n} )= (X[bar]-Mu)

(Sigma/\sqrt{n} )= \frac{(X[bar]-Mu)}{Z}

Sigma= \frac{(X[bar]-Mu)}{Z}*\sqrt{n}

Sigma*(\frac{Z}{(X[bar]-Mu)})= \sqrt{n}

n = (Sigma*(\frac{Z}{(X[bar]-Mu)}))^2

n = (16*(\frac{1.2}{(270-264)}))^2

n= 10.24 ≅ 11 pregnant women.

I hope it helps!

6 0
3 years ago
A flashlight is projecting a triangle onto a wall, as shown below,
Marat540 [252]
The answer is A..........
6 0
3 years ago
Other questions:
  • Determine the slope of the line 3x − 5y − 6 = 0. <br> a)-5/6<br> b)-1/4<br> c)3/5<br> d)3
    11·1 answer
  • Whats the answer please​
    11·1 answer
  • Makayla and Madison are combining their fabric to see how much they have in all. If Makayla has 1 1/2 yards of fabric and Madiso
    8·2 answers
  • * PLEASE HELP WILL GIVE BRAINIEST* Your portfolio must include a minimum of the following five types of equations and solutions:
    10·1 answer
  • Make x the subject of the formula x(2+a)=b(x+3)
    11·2 answers
  • The chances of winning the Maryland lottery are one chance in twenty-two million. The probability would be considered an example
    15·1 answer
  • A building with a height of 74m casts a shadow that is 37m long. A person standing next to the building casts a shadow that is 0
    15·1 answer
  • Sammy is trying to determine how many triangles she can crate out of a square grid that has a side of 10 inches. Use the image b
    5·2 answers
  • 45 yd<br> 24 yd<br> What is the length of the hypotenuse?
    11·2 answers
  • A dog won a race at the local fair by running 7 1/4 miles in exactly 2 hours. At this constant rate, how long does it take the s
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!