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Lemur [1.5K]
3 years ago
14

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:

10

Step-by-step explanation:

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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
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