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3 years ago

Could you help me with this

Mathematics

1 answer:

igor_vitrenko [27]3 years ago

3 0

I would say the 3rd option because it’s showing the enthusiasm in their voices by adding the exclamation mark

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a bird flies from the bottom of a canyon that is 62 2/5 feet below sea level to a nest that is 556 2/5 feet above sea level. wha

Serggg [28]

im so sorry. U_U *tears fall*

6 0

3 years ago

Suppose that you were not given the sample mean and sample standard deviation and instead you were given a list of data for the

Troyanec [42]

Answer:

So, the sample mean is 31.3.

So, the sample standard deviation is 6.98.

Step-by-step explanation:

We have a list of data for the speeds (in miles per hour) of the 20 vehicles. So, N=20.

We calculate the sample mean :

$\mu=\frac{19 +19 +22 +24 +25 +27 +28+ 37 +35 +30+ 37+ 36+ 39+ 40+ 43+ 30+ 31+ 36+ 33+ 35}{20}\\\\\mu=\frac{626}{20}\\\\\mu=31.3$

So, the sample mean is 31.3.

We use the formula for a sample standard deviation:

$\sigma=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\mu)^2}$

Now, we calculate the sum

$\sum_{i=1}^{20}(x_i-31.3)^2=(19-31.3)^2+(19-31.3)^2+(22-31.3)^2+(24-31.3)^2+(25-31.3)^2+(27-31.3)^2+(28-31.3)^2+(37-31.3)^2+(35-31.3)^2+(30-31.3)^2+(37-31.3)^2+(36-31.3)^2+(39-31.3)^2+(40-31.3)^2+(43-31.3)^2+(30-31.3)^2+(31-31.3)^2+(36-31.3)^2+(33-31.3)^2+(35-31.3)^2\\\\\sum_{i=1}^{20}(x_i-31.3})^2=926.2\\$

Therefore, we get

$\sigma=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\mu)^2}\\\\\sigma=\sqrt{\frac{1}{19}\cdot926.2}\\\\\sigma=6.98$

So, the sample standard deviation is 6.98.

3 0

3 years ago

Is 2 units by 7 units and 11 units and 37 units a scale copy

aleksley [76]

Answer:

what are u asking

Step-by-step explanation:

5 0

3 years ago

How many solutions will this system of equations have? x - 2y = 24 3x - 6y = 72

Feliz [49]

$x-2y=24 \ \ \ \ \ \ \ \ \ \ \ \ \ | \times (-3) \\
3x-6y=72 \\ \\
-3x+6y=-72 \\
\underline{3x-6y=72 \ \ \ \ \ \ \ } \\
3x-3x+6y-6y=72-72 \\
0=0 \\ 
always \ true \\ \\
\hbox{infinitely many solutions}$

The answer is B.

5 0

4 years ago

Read 2 more answers

The following sequence is an arithmetic sequence what comes next ? 7,___,17

ipn [44]

Since this is an arithmetic sequence, you can conclude that the addition to the number is constant.

Let x = the number asked

k = constant number added to the sequence

7 + k = x

x + k = 17

Solve the system of equation:

7 + k + k = 17

7 + 2k = 17

2k = 10

k = 5

Therefore, the missing number is 12 (7 + 5).

5 0

3 years ago