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3 years ago

. At a given water/cement ratio, a change in the cement content or aggregate grading can be made to

Advanced Placement (AP)

1 answer:

Lesechka [4]3 years ago

3 0

Answer:

It reduces strength.

Explanation:

It not desirable to produce concrete mixtures of a higher consistency than normal because the strength of the concrete decreases. Consistency plays an important role in the determination of strength of concrete. Less water than normal quantity in concrete increases the consistency but decreases strength due to incomplete chemical reaction while on the other hand, adding more water would increase water-cement ratio and reduces consistency as well as strength of the concrete so that's why necessary amount of water and cement should be added to get higher strength.

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If the wait time is less than 30 minutes for 75% of all patients in the emergency room, what is the probability that the

Greeley [361]

The probability that the proportion of patients who wait less than 30 minutes is 0.582 or less is 0.0020

<h3>What is probability? </h3>

Probability can be defined as the likelihood of an event to occur. In statistics, the mean of the sample distribution typically shows the probability of the population.

From the parameters given:

The sample size (n) = 55 patients
Let's assume that the mean (x) = 32 (i.e. 58.2%) of the patients

The sample proportion $\mathbf{\hat p}$ can be computed by using the expression:

$\mathbf{\hat p = \dfrac{x}{n}}$

$\mathbf{\hat p = \dfrac{32}{55}}$

$\mathbf{\hat p =0.582}$

If the percentage of the probability of all patients in the emergency room = 0.75

The probability that the proportion of patients who wait less than 30 minutes is 0.582 or less can be computed as:

$\mathbf{( \hat P \leq 0.582) = P \Big( \dfrac{\hat p - p}{\sqrt{\dfrac{p(1-p)}{n}}} \leq \dfrac{0.582 - 0.75}{\sqrt{\dfrac{0.75(1-0.75)}{55}}} \Big )}$

$\mathbf{( \hat P \leq 0.582 )= P \Big( Z \leq \dfrac{-0.168}{\sqrt{0.003409}} \Big )}$

$\mathbf{( \hat P \leq 0.582) = P \Big( Z \leq -2.88 \Big )}$

From the Z distribution table:

$\mathbf{( \hat P \leq 0.582) = 0.00198}$

$\mathbf{( \hat P \leq 0.582) \simeq 0.0020}$

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3 years ago

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While Melissa was working at the factory, a heavy machine fell on her and broke her legs. Her doctors say that she needs three m

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I believe D since she will be out of work.

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The property of wood that determine its strength or weakness

solniwko [45]

Answer:

The main property of wood that determines it's strength or weakness would be its density.

Explanation:

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3 years ago

Which version of the underlined portion of sentence 7 (reproduced below) creates the most logical transition from the previous s

sineoko [7]

Based on the previous part is not given answer will be subjective. The version of the underlined portion of sentence 7 that creates the most logical transition is As one would expect.

<h3>What is Logical transition?</h3>

The term Transitions are known to be a kind of words that set out a form of logical linkage between sentences and also between paragraphs, or between full parts of an essay.

Note that transitions can be seen as a whole sentences, phrases, or single words and it is often use to depict logical relationships.

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2 years ago

The ones circled for my daughter plz❤️

Ronch [10]

I can’t honestly see the picture

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