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4 years ago

Which is not true about the random sample method?

Mathematics

1 answer:

USPshnik [31]4 years ago

6 0

B. The sample is likely to represent one portion of the population.

This is impossible to say because it's random.

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What the answer im just not learning

azamat

9 •1 = 9 plus the divison sign So thats 5 divided by 9 = 1.8 yur welcome

7 0

3 years ago

If 20 assemblers can complete a certain job in 9 hours, how long will the same job take if the number of assemblers is cut back

adoni [48]

Answer:

6.75

Step-by-step explanation:

use the proportion:

1) 20:9=15:x

2) 20x=135

3) x=6.75

8 0

1 year ago

This morning, some dragons, horses, and chickens were playing in my backyard. I counted 15 heads, 50 legs, and 4 wings. How many

klasskru [66]

We are given

number of heads =15

we know that

any healthy dragon has three heads

horse has 1 head

chicken has 1 head

Let's assume

number of dragons is x

number of horses is y

number of chickens is z

so, we will get

first equation:

$3x+y+z=15$

number of legs =50

any healthy dragon has four legs

chicken has 2 legs

horse has four legs

so, we can get second equation as

$4x+4y+2z=50$

we can simplify it

$2(2x+2y+z)=50$

$2x+2y+z=25$

now, we can find third equation

dragon has two wings

horse has no wings

chicken has two wings

so, we will get third equations as

$2x+0y+2z=4$

now, we can simplify it

$2x+2z=4$

$2(x+z)=4$

$x+z=2$

so, we will get system of equations as

$3x+y+z=15$

$2x+2y+z=25$

$x+z=2$

now, we can use substitution

We can find for z from third equation

$z=2-x$

we can plug this in first equation

$3x+y+2-x=15$

now, we can solve for y

$2x+y+2=15$

$y=13-2x$

now, we can plug this z and y into second equation

$2x+2(13-2x)+2-x=25$

now, we can solve for x

$x-4x+26=23$

$-3x=-3$

$x=1$

now, we can find y and z

$y=13-2x$

we can plug x=1

$y=13-2*1$

$y=11$

$z=2-x$

we can plug x=1

$z=2-1$

$z=1$

Hence ,

number of dragons is 1

number of horses is 11

number of chicken is 1............Answer

7 0

3 years ago

Find the measure of angle EPH Enter your answer in the box.

umka2103 [35]

Answer:

Step-by-step explanation:

4 0

3 years ago

1.6093 kilometers times 90

xxTIMURxx [149]

the answer is 144.837 kilometers

6 0

3 years ago