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Ksivusya [100]
3 years ago
10

Help please! 15 points

Mathematics
1 answer:
Yanka [14]3 years ago
7 0

Answer:

the answer is 23. even tho it says he had 30 at the time you must subtract 7 because thats what he started with. hope i could help! :D

Step-by-step explanation:

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If the sample size is multiplied by 4, what happens to the standard deviation of the distribution of sample means?
Feliz [49]

Increasing the sample size by a factor of 4 or multiplying it by 4 is equal to increasing the standard error by 1/2.  Therefore, the interval will be half as varied.  This also works almost for population averages as lengthy as the multiplier from the t-curve doesn't modify much when increasing the sample size.

6 0
3 years ago
I need help with this
Kruka [31]

Answer:

<h2>V = 235.5 in³</h2>

Step-by-step explanation:

The formula of a volume of a cylinder:

V=\pi r^2H

r - radius

H - height

From the pictue we have r = 5in and H = 3in. Substitute:

x=\pi(5^2)(3)=\pi(25)(3)=75\pi\ in^3

\pi\approx3.14

Therefore

x=(75)(3.14)=235.5\ in^3

5 0
3 years ago
Read 2 more answers
The diagram shows a 5 cm x 5 cm x 5 cm cube.
Nitella [24]

Answer:

8.7 cm

Step-by-step explanation:

The question is a 2-two-step Pythagoras theorem. (c^2 = a^2 + b^2)

Consider as such, If I were to draw a diagonal line along the base of the cube what is the length of the diagonal line. To find out that we use the theorem. We can substitute a for 5 and b for 5 as well. So

a^2 +b^2 = c^2

5^2 + 5^2 = c^2

25 + 25 = c^2

√50 = c

Then since the line side of the cube is on a 3d angle we need to do the same process again but now using the imaginary diagonal line that we just calculated and the height (5).

a^2 +b^2 = c^2

√50^2 + 5^2 = c^2

50 + 25 = c^2

√75 = c

c = 8.6602...

<em>when rounded to 1 d.p.</em>

c = 8.7

Line AB is 8.7 cm long.

7 0
3 years ago
What is the absolute value if 14???
Sergio039 [100]
The absolute value of 14 is 14.l
Hope it helps :)
3 0
3 years ago
Read 2 more answers
Help me please<br> tysm!
crimeas [40]

Answer:

  • 2 is the awnser

55.^

Becuase 6-5=1

1-6=5

5-4=1

1-3=2

5 0
2 years ago
Read 2 more answers
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