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11Alexandr11 [23.1K]
2 years ago
8

A fourth-grade teacher gives homework every night in both mathematics and language arts. the time to complete the mathematics ho

mework has a mean of 10 minutes and a standard deviation of 3 minutes. the time to complete the language arts assignment has a mean of 12 minutes and a standard deviation of 4 minutes. assuming the times to complete homework assignments in math and language arts are independent, the standard deviation of the time required to complete the entire homework assignment is
Mathematics
2 answers:
xz_007 [3.2K]2 years ago
7 0
The standard deviation for the combined assignment is 5 minutes.

To combine the standard deviations, we use:

\sigma_z=\sqrt{(\sigma_x)^2+(\sigma_y)^2}

With our information, we have:
\sigma_z=\sqrt{3^2+4^2}
\\
\\=\sqrt{9+16}=\sqrt{25}=5
slega [8]2 years ago
7 0

Answer:

5 min

Step-by-step explanation:

The combine standard deviation, SDf, of two independent variables having standard deviation, SD1 and SD2, is given by:

SDf² = SD1² + SD2²

SDf²= 3² + 4²

SDf= 5

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Devaughn is 15 years younger than Sydney. The sum of their ages is 37 . What is Sydney's age?
posledela
Hi,
Let Sydney's age be x.
Devaughn=(x-15)
x+(x-15)=37
x+x-15=37
2x-15=37
2x=37+15
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x=52/2
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Sydney is 26 years old.
Hope this Helps you.
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(i) 809, 708, 607, _____, _ class 4<br>__class 4​
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Answer:

809, 708, 607, 506, 405, 304, 203, 102, 1, -100

Step-by-step explanation:

809, 708, 607, _____, _______

First term = 809

Second term = 708

Third term = 607

Difference between first term and second term = 809 - 708

= 101

Difference between second term and third term = 708 - 607

= 101

Therefore, the common difference is 101

Fourth term = 607 - 101

= 506

Fifth term = 506 - 101

= 405

Sixth term = 405 - 101

= 304

Seventh term = 304 - 101

= 203

Eighth term = 203 - 101

= 102

Ninth term = 102 - 101

= 1

Tenth term = 1 - 101

= - 100

809, 708, 607, 506, 405, 304, 203, 102, 1, -100

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What is the solution to the system that is created by the equation y=-x+6 and the graph shown below?
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The graph graphed is y=1/2x

so
y=1/2x and y=-x+6
y=y so
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3 years ago
Read 2 more answers
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