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
hoa [83]
3 years ago
13

A sample of 64 was taken from a population, with the mean of the sample being 43 and the standard deviation of the sample being

6. What is the 95% confidence interval for the mean of the population?
A. (42.25, 43.75)
B. (37.3, 48.7)
C. (41.5, 44.5)
D. (37, 49)
Mathematics
1 answer:
zzz [600]3 years ago
5 0

Answer:

C. (41.5, 44.5)

Step-by-step explanation:

Point estimate of population variance:

64(6²)/63

256/7

xbar +/- [z × sqrt(var/n)]

43 +/- [1.96 × sqrt(256/7 ÷ 64l]

43 +/- 1.481620735

[41.51837927 , 44.48162073]

You might be interested in
Solve mathematics problem in photo please!
laila [671]
Hello,

8/(x-7)=7/2
==>(x-7)*7=8*2
==>7x-49=16
==>7x=65
==> x =9+2/7

Answser A
8 0
3 years ago
Simplify: (–2x+y)(-58 y)<br> O 10x10,<br> 10xv2<br> 10xy<br> 10x10 ,
alekssr [168]

Answer:

Choice C

Step-by-step explanation:

(-2x^2y)(-5x^5y^3)=\\\\(-2)(-5)\times (x^2)(x^5)\times (y)(y^3)=\\\\10x^7y^4

Hope this helps!

8 0
3 years ago
PLEASE help !!! I’m struggling and I suck at math. Can someone answer this for me? For points and brainly !
Helen [10]

Answer:

\huge\boxed{2329 \ \text{pounds}}

Step-by-step explanation:

In order to solve this equation, let's see what we already know.

  • We know two points on the graph <em>which we can use to find the slope</em>

That's about it.

However, this can come useful to find the slope between the two points, which is the slope for the entire graph (since this is linear). The slope between two points is usually defined as \frac{\Delta y}{\Delta x} (change in y / change in x). Our two points are (18, 2017) and (48, 2212).

The change in y between our two points is 2212-2017 = 195, and the change in x is 48 - 18 = 30. Our slope will then be \frac{195}{30}, which comes out to be approximately 6.5. Therefore, our slope is 6.5.

Now that we know the slope, we can substitute inside our equation in slope intercept form.

y = 6.5x+b

We have yet to find b, the y-intercept (how much the plane itself weighs). To find b, we can substitute a point on the graph into the equation and solve for b. We know that the point (18, 2017) is on the graph so let's use that.

  • 2017 = 6.5 \cdot18 + b
  • 2017 = 117 + b
  • 1900= b

Now that we know our y-intercept is 1900, we can create our equation by using the slope and the y-intercept.

y=6.5x+1900

Finally, to find the weight of the plane with 66 pounds of fuel, we can substitute 66 inside this equation as x.

  • y = 6.5 \cdot66+ 1900
  • y = 429+1900
  • y=2329

So the plane weighed 2329 pounds with 66 gallons of fuel.

Hope this helped!

7 0
2 years ago
Read 2 more answers
Helppppppp pleaseeee again im sorry but i dont know any of itttttt.
Alchen [17]

Step-by-step explanation:

sqrt(5x)×(sqrt(8x²) - 2×sqrt(x)) =

sqrt(5x × 8x²) - 2×sqrt(5x × x) =

sqrt(40x) × x - 2x × sqrt(5) =

2x×sqrt(10x) - 2x×sqrt(5)

therefore, the last option is correct.

5 0
2 years ago
Find the area. 1m 2.1m and 0.9m
Elina [12.6K]
Just multiply w*l*h
1.89m cubed
6 0
3 years ago
Other questions:
  • If a bag contains 10 red, 6 yellow, 24 blue, and 8 white balloons, what is the part-to-whole ratio of blue balloons to all ballo
    12·2 answers
  • T divided by 5/12 =-3/10<br><br><br> t=____
    5·1 answer
  • A circular picture is 8 inches in diameter.
    11·1 answer
  • Can somebody please help
    13·1 answer
  • If the slope is 2 and the line goes through (3,-3) what is the equation?
    13·1 answer
  • A person walks away from a pulley pulling a rope slung over it. The rope is being held at a height 10 feet below the pulley. Sup
    6·1 answer
  • How can ΔABC be mapped to ΔXYZ?
    13·2 answers
  • SOMEONE PLEASE HELP ITS WORTH 90 POINTS
    6·1 answer
  • You need a 75% alcohol solution. On hand, you have a 25 mL of a 10% alcohol mixture. You also have 80%
    11·1 answer
  • During vacation, Dave and his brother, Scott,rode their bikes form their family's rental house to a pond to go fishing. Although
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!