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
love history [14]
3 years ago
14

Let x and s present the sample mean and sample standard deviation, respectively. Is it possible that around 70% of data lie with

in x-2s and x+2s? (Yes or no)
Mathematics
1 answer:
tensa zangetsu [6.8K]3 years ago
8 0

Using the Chebyshev's Theorem and the Empirical Rule, it is found that it is not possible that around 70% of data lie within x-2s and x+2s.

-------------------------

  • Distributions are classified as symmetric or not symmetric.
  • If the distribution is not symmetric, Chebyshev's Theorem is used, which states that <u>at least 75% of the measures are within 2 standard deviations of the mean</u>.
  • If the distribution is symmetric, the Empirical Rule is used, which states that <u>around 95% of the measures are within 2 standard deviations of the mean</u>.

Thus, from the above bullet points, at least 75% of the measures are within x-2s and x+2s, which means that the percentage of 70% is too small.

A similar problem is given at brainly.com/question/23612895

You might be interested in
Sally found that out of 750 cans stamped in the ½ hour trial run, 150 were not stamped. About how many were not stamped in 3 hou
Vera_Pavlovna [14]

Answer:

<em>About 900 cans not stamped in 3 hours</em>

Step-by-step explanation:

<u>Proportions</u>

Sally found that 150 cans were not stamped in the 1/2 hour trial run.

Following the same proportion in time, we can say:

150 cans not stamped in 1/2 hour. Multiplying by 2:

300 cans not stamped in 1 hour. Multiplying by 3:

900 cans not stamped in 3 hours

About 900 cans not stamped in 3 hours

7 0
2 years ago
At Lauren's school library, students are allowed to have a balance of no less than -$12 and still check out books. Five days ago
denis-greek [22]
Yes because the fee will be $2×5(Days)=10 so she can still check out books but she can't have anymore late
8 0
3 years ago
Read 2 more answers
Help <br> Help<br> Help<br> Help<br> Help<br> Help
puteri [66]
You’re right, it’s just 100/25.
3 0
3 years ago
rasheed is buying wings and quesadillas for a party. A package of wings costs $8. A package of quesadillas costs $10. He must sp
Alexus [3.1K]
4 packages of wings and 4 packages of quesadillas
5 0
3 years ago
Read 2 more answers
If the function f(x) = -1/2x - 7 were graphed, which of the following would be true?
Fittoniya [83]
ANSWER

D. As the x-values increase, the y-values would decrease

EXPLANATION

The given function is
y =  -  \frac{1}{2} x - 7


The slope of this function is
m =  -  \frac{1}{2}

Since the slope is negative, there is a negative or an inverse relationship between x and y.

As the values of x increases, the values of y decreases.

Also, as the values of x decreases, the values of y increases.

The first option is not true because as x is becoming bigger and bigger negatively, y will become positive.

For instance, when
x =  - 40
y =  -  \frac{1}{2} ( - 40) - 7


This implies that,

y = 20 - 7 = 13

Options B is obviously not true because the function has a negative relationship between x and y.


Option C is also false because, x can be positive since it is the independent variable.

See graph



Therefore, the correct answer is option D.




5 0
3 years ago
Other questions:
  • Need to help my little sister with her math homework but i am really bad with decimals. PLEASE HELP!!!
    6·1 answer
  • Can some help me with 13 14 15 and 16 please
    7·1 answer
  • Need help 10 POINTS !!!
    15·2 answers
  • Evaluate (c − b2) + a3 for a = –3, b = –2, and c = –4.
    15·1 answer
  • Write the standard form of the line that passes through the given points. Include your work in your final answer. Type your answ
    11·1 answer
  • The graph shown below expresses a radical function that can be written in the form F(x)=a(x+k)^1/n+c. What does the graph tell y
    6·2 answers
  • PLEASE HELP! I WILL GIVE YOU BRAINLIEST!
    6·1 answer
  • Given f(x) = x^2 + 2 and g(x) = 2 – x, find a simplified expression for f(2x) + g(3x).
    14·1 answer
  • Can someone help me please
    15·1 answer
  • Please help me with this ASAP Don’t ANSWER With links please ****
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!