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
vfiekz [6]
3 years ago
11

Internet providers: In a survey of 935 homeowners with high-speed Internet, the average monthly cost of a high-speed Internet pl

an was $74.34 with standard deviation $12.18. Assume the plan costs to be approximately bell-shaped. Estimate the number of plans that cost between $62.16 and $86.52. Round to the nearest whole number.
Mathematics
1 answer:
BlackZzzverrR [31]3 years ago
7 0

Answer:

68% of plans cost between $62.16 and $86.52.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean: 74.34

Standard deviation: 12.18

Bell-shaped is the same as normally distributed.

Estimate the number of plans that cost between $62.16 and $86.52.

62.16 is one standard deviation below the mean.

86.52 is one standard deviation above the mean.

By the Empirical rule, 68% of the measures are within 1 standard deviation of the mean.

So

68% of plans cost between $62.16 and $86.52.

You might be interested in
What will be the result of substituting 2 for x in both expressions below?
den301095 [7]
Both expressions equal 5 when substituting 2 for x because the expressions are equivalent. Hope this helped :D
4 0
3 years ago
Please help if you would like brianleist! (No links please!) Thank you! :) have a great day as well! :)
Arlecino [84]

The answer to your question would be C.

5 0
2 years ago
Read 2 more answers
Danny charges $35 for 3 hours of swimming lessons.Martin charges $24 for 2 hours of swimming lessons. Who offers a better deal?
astraxan [27]
Martin offers a better deal because you only have to pay 48 dollars unlike with Danny where you have to pay 105 dollars just for a 3 hr. lesson.
7 0
3 years ago
A new car dealer offered to sell her demonstrator model for 90% of the retail price. If the sale price was $9,750, what was the
Rainbow [258]
The answer would be 10833.3 
4 0
3 years ago
Read 2 more answers
For what values of θ on the polar curve r=θ, with 0≤θ≤2π , are the tangent lines horizontal? Vertical?
Bond [772]
Given that r=\theta, then r'=1

The slope of a tangent line in the polar coordinate is given by:

m= \frac{r'\sin\theta+r\cos\theta}{r'\cos\theta-r\sin\theta}

Thus, we have:

m= \frac{\sin\theta+\theta\cos\theta}{\cos\theta-\theta\sin\theta}



Part A:

For horizontal tangent lines, m = 0.

Thus, we have:

\sin\theta+\theta\cos\theta=0 \\  \\ \theta\cos\theta=-\sin\theta \\  \\ \theta=- \frac{\sin\theta}{\cos\theta} =-\tan\theta

Therefore, the <span>values of θ on the polar curve r = θ, with 0 ≤ θ ≤ 2π, such that the tangent lines are horizontal are:

</span><span>θ = 0

</span>θ = <span>2.02875783811043
</span>
θ = <span>4.91318043943488



Part B:

For vertical tangent lines, \frac{1}{m} =0

Thus, we have:

\cos\theta-\theta\sin\theta=0 \\  \\ \Rightarrow\theta\sin\theta=\cos\theta \\  \\ \Rightarrow\theta= \frac{\cos\theta}{\sin\theta} =\sec\theta

</span>Therefore, the <span>values of θ on the polar curve r = θ, with 0 ≤ θ ≤ 2π, such that the tangent lines are vertical are:

</span>θ = <span>4.91718592528713</span>
3 0
3 years ago
Other questions:
  • Also another answer choice, D 9.9
    12·1 answer
  • For all functions of the form f(x)=ax^2+bx+c which is true when b=0
    13·1 answer
  • An irregular figure was broken into a triangle and rectangle. The area of the triangle is in2. The area of the rectangle is in2.
    6·1 answer
  • Is a fraction always less than a whole number
    6·2 answers
  • There is a 40% chance that you will be elected president of the history club. There is a 10% chance that your friend will be ele
    11·1 answer
  • 1/4 + 1/2 ÷ 3/8 = ?<br><br><br> Please Answer quickly im in a test!
    14·2 answers
  • Drag the values to order them from least to greatest, with the least at the top.
    7·1 answer
  • An African elephant weighed 209 lbs when it was born. Baby elephants gain an average of 38 lbs per week.
    15·1 answer
  • Error Analysis! Answer both parts of the question.
    12·1 answer
  • I need to know what is the slope line passing thorough the points(0,-5) and (4,2
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!