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3 years ago

Help me please! I'd really appreciate it

Mathematics

1 answer:

Svetllana [295]3 years ago

4 0

The ratio of the sides are the same. So 6/24=x/56. This leads to x being 14.

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You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

svetoff [14.1K]

Answer:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

Step-by-step explanation:

We have the following info:

$ME = 50$ margin of error desired

$\sigma = 1000$ the standard deviation for this case

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =50 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=0.01$ . And for this case would be $z_{\alpha/2}=2.58$ , replacing into formula (b) we got:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

5 0

2 years ago

In a bag of marbles you have three green, two yellow, six blue, and nine red marbles. What is the probability of picking a red m

guajiro [1.7K]

$|\Omega|=3+2+6+9=20-a\ number\ of\ all\ marables\\\\|R|=9-a\ number\ of\ red\ marables\\\\\boxed{P(R)=\dfrac{9}{20}}$

3 0

2 years ago

36b + 13 + 12b = − 11,

AlexFokin [52]

Answer:

-0.5

Step-by-step explanation:

36b+12b=-11-13

48b=-24

B=-24/48=-1/2

B=-0.5

Please mark as brainliest

3 0

2 years ago

A ____________ has no dimension and is represented by a small dot.

monitta

Answer:

Point

Step-by-step explanation:

If you are referring to geometry

7 0

2 years ago

Ken started a savings account for school. He plans on spending 10% of the money he earns for leisure activities. He needs to hav

KiRa [710]

Answer:

He must earn $2,400 to cover both leisure and $2,160 for school expenses.

Step-by-step explanation:

Let the total amount Ken must earn be k. Then 10% of that would cover leisure activities and the remaining 90% specifically for school expenses.

Then 0.90k = $2,160, and k = $2,400.

He must earn $2,400 to cover both leisure and $2,160 for school expenses.

7 0

2 years ago