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Anna [14]
2 years ago
15

1:12 p.m to 8:11 p.m

Mathematics
1 answer:
Helen [10]2 years ago
7 0

Answer:

7:59

Step-by-step explanation:

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Determine whether the number is rational or irrational: -21*
timofeeve [1]

Answer:

Rational

Step-by-step explanation:

Pi is a rational number

6 0
2 years ago
Triangle ABC is similar to triangle DEF. What is the value of x ?
Delicious77 [7]
48382939392838338383839
5 0
2 years ago
Can someone help me with this plz??? I will mark u brainliest!!!
MrMuchimi

Answer:

a is 622

Step-by-step explanation:

5 0
2 years ago
Pls answer it urgent pls I couldn't find answers for this anywhere Pls give answer with formulas and steps 4/9 ÷ -5/7
lisabon 2012 [21]

Answer:

-28/45

Step-by-step explanation:

Here, we want to find the result of a division

What we have to do here is to flip the fraction on the right hand side , then change the sign from division to multiplication

We have this as;

4/9 * -7/5

= -28/45

7 0
2 years ago
According to the Oxnard College Student Success Committee report in the previous year, we believe that 18% of students struggle
gladu [14]

Answer:

A sample size of 392 is required.

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}}

18% of students struggle in their classes because they don't spend more than 8 hours studying independently outside of a 4-unit class.

This means that \pi = 0.18

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.

You would like to be 99% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required?

A sample size of n is required.

n is found when M = 0.05. So

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

0.05 = 2.575\sqrt{\frac{0.18*0.82}{n}}

0.05\sqrt{n} = 2.575\sqrt{0.18*0.82}

\sqrt{n} = \frac{2.575\sqrt{0.18*0.82}}{0.05}

(\sqrt{n})^2 = (\frac{2.575\sqrt{0.18*0.82}}{0.05})^2

n = 391.5

Rounding up:

A sample size of 392 is required.

8 0
2 years ago
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