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3 years ago

HELP NOW PLS ( +brain lost)

Mathematics

1 answer:

Lerok [7]3 years ago

7 0

Answer:

4/12

Step-by-step explanation:

What is the question specifically

1 4

_ = _

3 12

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The standard deviation of a sample taken from population A is 17.6 for a sample of 25.

lawyer [7]

Answer:

The standard deviation of the sample mean differences is _5.23_

Step-by-step explanation:

We have a sample of a population A and a sample of a population B.

For the sample of population A, the standard deviation $\sigma_A$ is

$\sigma_A = 17.6$

The sample size $n_A$ is:

$n_A = 25$ .

For the sample of population B, the standard deviation $\sigma_B$ is

$\sigma_B = 21.2$

The sample size $n_B$ is:

$n_B = 30$ .

Then the standard deviation for the difference of means has the following form:

$\sigma=\sqrt{\frac{\sigma_A^2}{n_A}+\frac{\sigma_B^2}{n_B}}$

Finally

$\sigma=\sqrt{\frac{17.6^2}{25}+\frac{21.2^2}{30}}\\\\\sigma= 5.23$

7 0

4 years ago

The solution of w + c < 8 is w < 3. What is the value of c?

lisov135 [29]

Step-by-step explanation:

C is less than 5

Hope this helps you

7 0

2 years ago

This math problem is a bit confusing for me please help -108π=6πj

belka [17]

Answer:

j= -18

Step-by-step explanation:

8 0

3 years ago

Ni Hua is an adventurous traveler. He skydives twice in every island he visits and skydives thrice in every peninsula he visits.

Gnesinka [82]

Let the number of islands visited be x and that peninsulas be y
thus,
x+y=19
⇒y=19-x.........i
if he skydives twice in islands and thrice in peninsulas, then the total number of skydives will be:
2x+3y=45.....ii

substituting i in ii we get:
2x+3(19-x)=45
2x+57-3x=45
putting like terms together we get:
2x-3x=45-57
-x=-12
therefore
x=12
and
y=19-x=19-12=7
hence the number of islands visited was 12 and that of peninsulas was 7

3 0

3 years ago

Multiply. (4x+2)(3x+3)

Wewaii [24]

The right answer is 12x^2+18x+6

please see the attached picture for full solution

Hope it helps

Good luck on your assignment

4 0

3 years ago

Read 2 more answers