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
djverab [1.8K]
3 years ago
13

8 is 40% of what number? Please show your work

Mathematics
2 answers:
hammer [34]3 years ago
6 0
8 = 40%

Divide each side by 2.

4 = 20%

Multiply each side by 5.

4*5 = 20

20*5 = 100

8 is 40% of 20.

Check:

20 * 0.4 = 8
KengaRu [80]3 years ago
5 0
Do a proportion
40/100= 8/x
8 x 100= 800
Cross multiply and divide
800 divided by 40= 20
So answer is 20
You might be interested in
Given a population with a mean of muμequals=100100 and a variance of sigma squaredσ2equals=3636​, the central limit theorem appl
lakkis [162]

Answer:

a) \bar X \sim N(100,\frac{6}{\sqrt{25}}=1.2)

\mu_{\bar X}=100 \sigma^2_{\bar X}=1

b) P(\bar X >101)=1-P(\bar X

c) P(\bar X

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".  

The complement rule is a theorem that provides a connection between the probability of an event and the probability of the complement of the event. Lat A the event of interest and A' the complement. The rule is defined by: P(A)+P(A') =1

Let X the random variable that represent the variable of interest on this case, and for this case we know the distribution for X is given by:  

X \sim N(\mu=100,\sigma=6)  

And let \bar X represent the sample mean, by the central limit theorem, the distribution for the sample mean is given by:  

\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})  

a. What are the mean and variance of the sampling distribution for the sample​ means?

\bar X \sim N(100,\frac{6}{\sqrt{25}}=1.2)

\mu_{\bar X}=100 \sigma^2_{\bar X}=1.2^2=1.44

b. What is the probability that x overbarxgreater than>101

First we can to find the z score for the value of 101. And in order to do this we need to apply the formula for the z score given by:  

z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}  

If we apply this formula to our probability we got this:  

z=\frac{101-100}{\frac{6}{\sqrt{25}}}=0.833  

And we want to find this probability:

P(\bar X >101)=1-P(\bar X

On this last step we use the complement rule.  

c. What is the probability that x bar 98less than

First we can to find the z score for the value of 98.

z=\frac{98-100}{\frac{6}{\sqrt{25}}}=-1.67  

And we want to find this probability:

P(\bar X

5 0
3 years ago
How many solutions does this equation have
Stells [14]

Answer:

I m not sure, I can't see

Step-by-step explanation:

8 0
3 years ago
The population of a bacteria colony doubles every 6 hours. For example, starting with a sample of 10 bacteria, after 6 hours the
almond37 [142]

Answer:

If the bacteria grow for six hours, each bacterium will divide 3 times per hour × 6 hours = 18 times.

Every time the bacteria reproduce, the number doubles.

5 0
2 years ago
PLEASE HELP!!!!<br> Find m Will give brainliest for correct answer
kherson [118]

Answer:

r = 5

Step-by-step explanation:

8 0
2 years ago
At Nick's school, 25% of the 72 sixth-grade students wear either glasses or contact lenses. How many sixth-grade students wear e
Dahasolnce [82]

Answer:

18 kids

Step-by-step explanation:

72 x .25

18 is 25% or 72

7 0
2 years ago
Other questions:
  • What is 450,000 expressed in scientific notation?
    5·2 answers
  • If vertex T' is at (2,-2) what are the coordinates of vertex s
    7·1 answer
  • Solve easy equation (for points) 8+x+15=20
    7·1 answer
  • What is the value of n in the equation –(2n + 4) + 6 = –9 + 4(2n + 1)?
    7·2 answers
  • What is (a+b)(x)?<br> Let a(x)=3x^2-5x+2 and b(x)=x^2+8x-10
    13·1 answer
  • Change 7ft/sec to ft/hr i don't need proof
    11·2 answers
  • 4x + 20=? it’s hard and i’m confused
    10·2 answers
  • HELP ILL GIVE BRAINLISTTT!
    12·1 answer
  • A right prism has height 7½ and triangular bases with sides of length 5, 12, and 13 What is the: Total Surface Area of the Prism
    11·1 answer
  • IMAGE BELOW I WILL MARK BRAINIEST
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!