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3 years ago

What does it mean to be a standard deviation away from the mean?

1 answer:

8 0

Mean can also be thought of as average.

Standard deviation is a bit more difficult to describe. It is a statistic that can help measure how spread out the data gets.

Depending on the distribution, data within 1 standard deviation of the mean can be considered fairly common and expected. Essentially it tells you that data is not exceptionally high or exceptionally low.

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What set of reflections and rotations would carry rectangle ABCD onto Itself? (4 polnts)

shtirl [24]

Answer:

answer is b

Step-by-step explanation:

because photomath said so

7 0

3 years ago

Which is an equivalent form of the first equation that when added to second equation eliminates the x terms? 4/5 x-3/5y=18

Fittoniya [83]

Answer:

$-8x + 6y = -180$

Step-by-step explanation:

Given

$\frac{4}{5} x-\frac{3}{5}y=18$

$8x + 12y = 11$

Required

Equivalent form of the first equation that eliminates x when added to the second

To do this, we simply make the coefficients of x to be opposite in both equations.

In the second equation, the coefficient of x is 8.

So, we need to make the coefficient of x -8, in the first equation.

$\frac{4}{5} x-\frac{3}{5}y=18$

Multiply by -10

$-10 * [\frac{4}{5} x-\frac{3}{5}y=18]$

$\frac{-40}{5} x+\frac{30}{5}y=-180$

$-8x + 6y = -180$

<em>When this is added to the first equation, the x terms becomes eliminated</em>

6 0

3 years ago

This diagram shows the dimensions of a concrete piece used to build a deck.

Inga [223]

Answer:

V=1,840in

Step-by-step explanation:

divide the shape into 2 rectangles V=l x w x h find the volume for the 2 rectangles and then add the answers

5x8x10=400

20x8x9=1,440

400+1,440=1,840in

6 0

3 years ago

Please help i dont understand :(

saul85 [17]

Answer:306

Step-by-step explanation:

since the width of the bottom square is 10, you split it between the triangles on top. You have to do this because 7 is not the whole width of the two triangles. So then the width of the triangles would be 12, 12 times 9 is 108, you'd have 216 total for both triangles and then the area of the square is 90, 90 plus 216 is 306.

6 0

3 years ago

31% of 40 estimate what is it please help

chubhunter [2.5K]

31% of 40 is 12.4 exactly

7 0

3 years ago

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