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3 years ago

Please help It’s almost due

Mathematics

2 answers:

Tems11 [23]3 years ago

8 0

Answer:

10 people

Step-by-step explanation:

oee [108]3 years ago

3 0

Answer:

Step-by-step explanation:

You might be interested in

What is a reasonable estimate 7 3/4 X 2 2/3

vitfil [10]

A estimated answer would be 15 an exact answer would probably be maybe 15 1/4 I think.

3 0

4 years ago

A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should di

frutty [35]

Answer:

The sample size suggested by this statement is of at least 4145.

Step-by-step explanation:

This statement states that the 99% confidence interval has a margin of error of 2 percentage points.

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

99% confidence level:

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

Find the sample size suggested by this statement.

The sample size is at least n.

n is found when M = 0.02.

We don't know the true proportion, so we use $\pi = 0.5$ , which is when the largest sample size will be needed.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.02 = 2.575\sqrt{\frac{0.5*0.5}{n}}$

$0.02\sqrt{n} = 2.575*0.5$

$\sqrt{n} = \frac{2.575*0.5}{0.02}$

$(\sqrt{n})^{2} = (\frac{2.575*0.5}{0.02})^{2}$

$n = 4144.14$

Rounding up

The sample size suggested by this statement is of at least 4145.

5 0

3 years ago

Do the ratios 20:18 and 3:2 form a proportion?

DENIUS [597]

Answer:

No.

Step-by-step explanation:

When trying to make this into a proportion, the left and right sides of the equation are unequal, therefore this is invalid.

#learnwithbrainly

#brainliestplease

8 0

3 years ago

Read 2 more answers

Find value of x, show your work

Zina [86]

Here is your answer

$\huge x=\frac{35}{2}cm= 17.5cm$

REASON :
AB//CD

So,

/_A=/_D ... (alternate int. angles)

/_B=/_C ... (alt. int. angles)

So,

Tri.ABE~Tri.DCE... (by AA similarity)

Therefore,

Corresponding sides are proportional

i.e.

$\frac{AE}{DE}=\frac{AB}{DC}$

$\frac{5}{x}=\frac{4}{14}$

$x=\frac{5×14}{4}$

$x=\frac{5×7}{2}$

$x=\frac{35}{2}$

HOPE IT IS USEFUL

5 0

3 years ago

I would like to purchase 20 products at the cost of $65 per product the state sales tax is 3.5% what is the total

Ivanshal [37]

1,650 is the answer to your question

7 0

3 years ago