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
Fittoniya [83]
3 years ago
12

HELP I WILL GIVE BRAINLIEST AND THANK AND 5 STAR!

Mathematics
2 answers:
guajiro [1.7K]3 years ago
7 0

Answer:

2 and 16/3 is the answer

Step-by-step explanation:

4.

putting value of n in given expression

20-3.6

20-18

2 answer

5.

putting value of n in given expression

(2/3).6+(2/3).2

4+(4/3)

(12+4)/3

16/3 answer

photoshop1234 [79]3 years ago
5 0

Answer:

4.     2

Step-by-step explanation:

Subtitue the value of variable into the equation and simplify 2

You might be interested in
A random sample of n = 40 observations from a quantitative population produced a mean x = 2.2 and a standard deviation s = 0.29.
zmey [24]

Answer:

t=\frac{2.2-2.1}{\frac{0.29}{\sqrt{40}}}=2.18    

df=n-1=40-1=39  

Since is a one side test the p value would be:  

p_v =P(t_{(39)}>2.18)=0.0177  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, and then the population mes seems to be higher than 2.1 at 5% of significance

Step-by-step explanation:

Data given and notation  

\bar X=2.2 represent the sample mean

s=0.29 represent the sample standard deviation

n=40 sample size  

\mu_o =2.1 represent the value that we want to test

\alpha=0.05 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is higher than 2,1, the system of hypothesis would be:  

Null hypothesis:\mu \leq 2.1  

Alternative hypothesis:\mu > 2.1  

If we analyze the size for the sample is > 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

t=\frac{2.2-2.1}{\frac{0.29}{\sqrt{40}}}=2.18    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=40-1=39  

Since is a one side test the p value would be:  

p_v =P(t_{(39)}>2.18)=0.0177  

Conclusion  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, and then the population mes seems to be higher than 2.1 at 5% of significance

7 0
3 years ago
A shopkeeper has 2,625 markers. He would like to pack 25 markers in each box. How many boxes will he need?
Lerok [7]

Answer:

it's 105 boxes.

Step-by-step explanation:

hope this helps! and sorry for the person just trying to get points.

5 0
3 years ago
75dollars with a 10 percent sales tax
Afina-wow [57]
With a 10 percent tax, you have 90 percent left. 75*.9=$67.50
4 0
3 years ago
Read 2 more answers
What are the potential solutions of In(x^2-25)=0?
Maslowich

Answer:

x =\pm \sqrt{26}

Step-by-step explanation:

<u>Given </u><u>:</u><u>-</u><u> </u>

  • ln ( x² - 25 ) = 0

And we need to find the potential solutions of it. The given equation is the logarithm of x² - 25 to the base e . e is Euler's Number here. So it can be written as ,

<u>Equation</u><u> </u><u>:</u><u>-</u><u> </u>

\implies log_e {(x^2-25)}= 0

<u>In </u><u>general</u><u> </u><u>:</u><u>-</u><u> </u>

  • If we have a logarithmic equation as ,

\implies log_a b = c

Then this can be written as ,

\implies a^c = b

In a similar way we can write the given equation as ,

\implies e^0 = x^2 - 25

  • Now also we know that a^0 = 1 Therefore , the equation becomes ,

\implies 1 = x^2 - 25 \\\\\implies x^2 = 25 + 1 \\\\\implies x^2 = 26 \\\\\implies x =\sqrt{26} \\\\\implies x = \pm \sqrt{ 26}

<u>Hence</u><u> the</u><u> </u><u>Solution</u><u> </u><u>of </u><u>the</u><u> given</u><u> equation</u><u> is</u><u> </u><u>±</u><u>√</u><u>2</u><u>6</u><u>.</u>

6 0
3 years ago
Factor completely, 9x4 -225y8
Furkat [3]

Step-by-step explanation:

9x4 -225y8 \\  = 3 \times 3 \times x \times 2 \times 2 -3 \times 5 \times 3 \times 5 \times y \times 2 \times 2 \times 2

4 0
3 years ago
Other questions:
  • Noah built a fenced dog run that is 8 yards long and 6 yards wide. he placed posts at every corner and every yard along the leng
    6·2 answers
  • Mark and his three friends ate out at Applebee’s. Their bill totaled $52.35. If they left the server a 20% tip, how much would e
    9·1 answer
  • A doctor wants to create a graph to highlight the percentages of her patients who are various ages.
    15·1 answer
  • Liam rode his bike to the store every day. It took him 45 minutes to get to school and 45 minutes to get home. If he rode for 3
    13·1 answer
  • 12. It takes Daphne 25 minutes to assemble a model plane. During her work
    6·1 answer
  • Area model for 31 x 50
    8·1 answer
  • 3 of the digits 0-9 are chosen randomly by a computer what is the probability that it will choose 3 sequential digits?
    5·1 answer
  • Find the measure x of an angle that is complementary to a 67° angle.
    6·1 answer
  • Solve each system of equations.
    5·2 answers
  • Please help me on this question hery hard 5x5=
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!