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3 years ago

Using the dotplot and the difference in mean distances

Mathematics

1 answer:

ValentinkaMS [17]3 years ago

3 0

Notice that the variation of the mean by observing the dot plot alone shows that there is a slight difference in the means but not one that is significant. Therefore, the correct answer is D.

<h3>What is the definition of Mean Difference?</h3>

Mean difference is a statistical term that is used to measure the definite difference between the mean value of distribution among two sets of data.

In this case, the two sets of data are data from the new balls and the data from the old ball.

See the link below for more about Mean Difference:
brainly.com/question/814700

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945 times 134 is equal to what

allochka39001 [22]

945*134=126630

if you line them up and then multiply like that it makes it easier or just use a calculator i guess

8 0

3 years ago

A sequence is defined by the recursive function f(n 1) = one-halff(n). if f(3) = 9 , what is f(1) ?

Afina-wow [57]

The value of f(1) = 81

Step-by-step explanation:

For the recursive function, f(n+1) = one-half(n)

Thus, when n = 2,

f(3) = 9

If n = 1,

f(2) = 9×3

f(2) = 27

If n = 0,

f(1) = 27 ×3

f(1) = 81

Learn more about Functions:

brainly.com/question/11624077

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4 0

2 years ago

Please help me out!! :)

AVprozaik [17]

3.142×16.4=51.5288 and if round that it gives you 51.53

4 0

4 years ago

Read 2 more answers

If points A and B are randomly placed on the circumference of a circle with a radius of 2 cm, what is the probability that the l

OLga [1]

Answer:

The probability that the length of chord AB > 2 cm is 2/3 ⇒ D

Step-by-step explanation:

* Lets explain how to solve the problem

- Points A and B are randomly placed on the circumference of a

circle with a radius of 2 cm

- We need to find the probability that the length of chord AB is

greater than 2 cm

- Probability = required length of arc / circumference

- Assume that the length of the chord AB is 2 and the center of

the circle is labeled M

- The radius of the circle is 2 and AB = 2

- In Δ AMB

∵ MA= MB = 2 radii

∵ AB = 2

∴ Δ AMB is an equilateral triangle

∴ m∠AMB = π/3

∵ The length of an arc = r Ф , where r is the radius of the circle and

Ф is the central angle subtended by this arc

∵ r = 2 , Ф = π/3

∴ The length of arc AB = 2 × π/3 = 2π/3

- The arc AB is in the half of the circle then there are another arc

with the same length in the other half of the circle

- The length of the arc we must excluded from the length of the

circle to have the part of length of AB is greater than 2 is

2(2π/3) = 4π/3

∴ The length of the excluded arc is 4π/3

∵ The length of the circle is 2πr

∵ r = 2

∴ The length of the circle = 2π(2) = 4π

- The required arc = length circle - length excluded arc

∵ The length of the excluded arc = 4π/3

∵ The length of the circle = 4π

∴ The required arc = 4π - 4π/3 = 8π/3

- Probability = required length of arc / circumference

∴ Probability = (8π/3)/(4π) = 2/3

∴ The probability that the length of chord AB > 2 cm is 2/3

4 0

3 years ago

Solve for x. 3(x-1)-8=4(1+x)+5 Also could someone please explain how to do this??

Marianna [84]

9514 1404 393

Answer:

x = -20

Step-by-step explanation:

First, simplify the equation. Eliminate parentheses and combine terms.

3(x -1) -8 = 4(1 +x) +5 . . . . . . . given

3x -3 -8 = 4 +4x +5 . . . . . . . . eliminate parentheses (distributive property)

3x -11 = 4x +9 . . . . . . . . . . . . combine like terms

We can put all the x-terms on the right by subtracting 3x from both sides.

3x -11 -3x = 4x +9 -3x

-11 = x +9

And we can get the x-term by itself by subtracting 9 from both sides.

-11 -9 = x +9 -9

-20 = x . . . . . . . . . . this is the solution

Check

3(-20 -1) -8 = 4(1 -20) +5

3(-21) -8 = 4(-19) +5

-63 -8 = -76 +5

-71 = -71 . . . . . . . . . true, the answer checks OK

_____

Additional comment

We observe that the two x-terms are 3x and 4x. The smaller of these is 3x, so when we subtract that from 4x we will have a positive result. That is why we chose to subtract 3x, even though it leaves the x-term on the right side of the equation. We could have subtracted 4x to get -x -11 = 9. I find it easier not to make a mistake if the variable has a positive coefficient.

3 0

3 years ago