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3 years ago

Is 3.275 rational number

Mathematics

2 answers:

vagabundo [1.1K]3 years ago

4 0

Yes it is because it’s ends

Vladimir79 [104]3 years ago

3 0

Answer:

yes it is rational number examples

3.275/5

3.275/10

hope.it helps

plz mark a brainliest

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What 4 number add up to 47

vagabundo [1.1K]

20 + 6 + 11 + 10 adds up to 47

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3 years ago

What is the tangent of angle P?<br> 12/13<br> 5/13<br> 12/5<br> 5/12

scoundrel [369]

Tangent is opposite side/ adjacent side
TanP = 5/12
Hope it helped!

3 0

3 years ago

A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained i

Scorpion4ik [409]

Answer:

a) We need a sample size of at least 3109.

b) We need a sample size of at least 4145.

Step-by-step explanation:

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 $Z = 2.575$ .

(a) he uses a previous estimate of 25%?

we need a sample of size at least n.

n is found when $M = 0.02, \pi = 0.25$ . So

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

$0.02 = 2.575\sqrt{\frac{0.25*0.75}{n}}$

$0.02\sqrt{n} = 2.575\sqrt{0.25*0.75}$

$\sqrt{n} = \frac{2.575\sqrt{0.25*0.75}}{0.02}$

$(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.25*0.75}}{0.02})^{2}$

$n = 3108.1$

We need a sample size of at least 3109.

(b) he does not use any prior estimates?

When we do not use any prior estimate, we use $\pi = 0.5$

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

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

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

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

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

$n = 4144.1$

Rounding up

We need a sample size of at least 4145.

8 0

3 years ago

Approximately how many hours would someone who earns $7.51 per hour have to work to earn $202.85? 27 30 35 37

DerKrebs [107]

1 hr = 7.51

202.85/7.51= 27.01 hours

5 0

3 years ago

Read 2 more answers

Which answer is the equation of the line represented in function notation?

Vikki [24]

The answer will be D

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3 years ago