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4 years ago

YOU WILL GET A THANKS, 11 POINTS, INCLUDING A HAPPY STUDENT

Mathematics

2 answers:

Semmy [17]4 years ago

8 0

320 was the difference in Cheyenne's score

Darina [25.2K]4 years ago

7 0

The difference is 320

I got this by subtracting 420 and 100

420 - 100 = 320

Hope this helps

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Use the confidence interval to find the estimated margin of error. Then find the sample mean.

erma4kov [3.2K]

Answer: The estimated margin of error = 0.5 centimeter

The sample mean = 4.3 centimeters

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\pm E$

or $(\overline{x}-E,\ \overline{x}+E)$

, where $\overline{x}$ = sample mean.

E = Margin of error .

The given confidence interval : (3.8,4.8 )

Lower limit : $\overline{x}-E=3.8$ (1)

Upper limit = $\overline{x}+E=4.8$ (2)

Eliminate equation (1) from (2) , we get

$2E=1.0\\\\\Rightarrow\ E=\dfrac{1}{2}=0.5$

⇒ The estimated margin of error = 0.5 centimeter

Add (1) and (2) ,we get

$2\overline{x}-E=8.6\\\\\Rightarrow\ \overline{x}=\dfrac{8.6}{2}=4.3$

⇒ The sample mean = 4.3 centimeters

3 0

3 years ago

The ratio of the number of text messages sent by Lucas to the number of text messages sent by his sister is 3 to 4. Lucas sent 1

vitfil [10]

Answer:

the answer is 24

Step-by-step explanation:

because if you do 18÷3, it equals 6. then you would do 6×4=24

7 0

4 years ago

Gandalf the Grey started in the Forest of Mirkwood at a point P with coordinates (3, 0) and arrived in the Iron Hills at the poi

Verdich [7]

Answer:

Turning point has coordinates $\left(\dfrac{27}{13},\dfrac{8}{13}\right)$

Step-by-step explanation:

Gandalf the Grey started in the Forest of Mirkwood at a point P(3, 0) and began walking in the direction of the vector $\vec{v}=-3i+2j.$ The coordinates of the vector v are (-3,2). Then he changed the direction at a right angle, so he was walking in the direction of the vector $\vec{u}=2i+3j$ (vectors u and v are perpendicular).