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il63 [147K]
3 years ago
10

What is center: (-4,-12) Radius: 4 ?

Mathematics
2 answers:
netineya [11]3 years ago
3 0

Answer:

have a great day ❤️❤️☺️

Ghella [55]3 years ago
3 0

Answer:

above one is correct mark him as brnlist

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A data set of 27 different numbers has a mean of 33 and a median of 33. A new data set is
Svetllana [295]

Answer:

Option D.

Step-by-step explanation:

Suppose that we have a set of N values:

{x₁, x₂, ..., xₙ}

The median is the value in the middle, and the mean is calculated as:

M = \frac{(x_1 + x_2 + x_3 ... + x_n)}{N}

Because here we have "the median" then we will assume that N is odd, and there is only one median, the value "k"  (if N was even, the median would be the mean of the two middle values, that case is really similar to the case where N is odd, so solving only one of the cases is enough)

Now we add 7 to all the values greater than the median

We subtract 7 to all values smaller than the median.

Then the median remains unchanged (because we did not add nor subtract anything to the median).

The new mean will be:

M' = \frac{(x_1 - 7) + (x_2 - 7) + ... + (x_{k}) + ... + (x_n + 7)}{N} = \frac{(x_1 + x_2 + ... + x_n) + (-7)*(n/2 - 0.5) + 7*(n/2 - 0.5)}{N}  = \frac{(x_1 + x_2 + ... + x_n)}{N} = M

So the mean does not change.

Because the mean is computed as the sum of the numbers divided by N, and the mean does not change, and N does not change, then the sum of the numbers does not change.

Finally, the standard deviation is computed as:

SD = \sqrt{\frac{(x_1 - M)^2 + ... + (xn - M)^2}{N} }

Because M does not change, if we add or subtract numbers to some of the values, the standard deviation will change (Because all the terms are squared, so the added and subtracted sevens don't cancel like in the previous cases)

Then the only value that does not have the same value in both the original and new data sets is the standard deviation.

6 0
3 years ago
Choose Yes or No to tell if the statement is correct.
miss Akunina [59]

Answer:

yes

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Sebastian's friend gives him 4 special-edition baseball cards to start his own collection. Sebastian then buys 6 new baseball ca
saveliy_v [14]

Answer:

D

Step-by-step explanation:

its 6x + the 4 he gave him

3 0
3 years ago
Read 2 more answers
Answer the question in the picture below
iren2701 [21]

Answer:

16.25, 20, 13.75, 12.5, 7.5

Step-by-step explanation:

1cm= 2.5m

6.5x2.5= 16.25

8x2.5= 20

5.5x2.5= 13.75

5x2.5= 12.5

3x2.5= 7.5

8 0
3 years ago
Someone help me with this ASAP!!!
faust18 [17]

Answer:  The 2/9 should have been simplified to 2/3. Then multiply 1/7 and 2/3 to find the product, 2/21

You have to "simplify" both factors at the same time before moving on to multiplying them.

Step-by-step explanation:

Another way to do this is to multiply straight across 3/7 × 2/9 to get  6/63 then notice that the numerator and denominator are both multiples of 3.

Simplify by dividing numerator and denominator by 3 to get 2/21

3 0
3 years ago
Read 2 more answers
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