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3 years ago

PLEASE ANSWER! <3 TYSM!

Mathematics

1 answer:

Fofino [41]3 years ago

6 0

Answer:

If the probability that she wins is i/j.

Then the probability that she does not win is (1-i)/j.

For example, if the chance that she wins is 2/3, then the chance that she doesn't win is (3-2)/3, or 1/3.

Let me know if this helps!

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Which algebraic expression represents “the train traveled nine times as far on Tuesday as on Monday”?

creativ13 [48]

" 9n " represents “the train traveled nine times as far on Tuesday as on Monday.

5 0

3 years ago

Read 2 more answers

URGENT GEO PLEASE HELP?

Naddika [18.5K]

360-120=240 so x is 240

4 0

4 years ago

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Public health officials claim that people living in low income neighborhoods have different Physical Activity Levels (PAL) than

Naddika [18.5K]

Answer:

The z-score for this data is Z = -0.26.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean $\mu = p$ and standard deviation $s = \sqrt{\frac{p(1-p)}{n}}$

This is based on knowledge that in the U.S., the mean PAL is 1.65 and the standard deviation is 0.55.

This means that $\mu = 1.65, \sigma = 0.55$

A study took a random sample of 51 people who lived in low income neighborhoods and found their mean PAL to be 1.63.

This means that $n = 51, X = 1.63$

Using a one-sample z test, what is the z-score for this data

$Z = \frac{X - \mu}{\sigma}$

By the Central Limit Theorem

$Z = \frac{X - \mu}{s}$

$Z = \frac{1.63 - 1.65}{\frac{0.55}{\sqrt{51}}}$

$Z = -0.26$

The z-score for this data is Z = -0.26.

4 0

3 years ago

∠A and ∠B are vertical angles with m∠A=x and m∠B=3x−60 . What is m∠A ?

kow [346]

Answer:

m∠A=30°

Step-by-step explanation:

we know that

<u><em>Vertical Angles</em></u> are the angles opposite each other when two lines cross.

Vertical angles always are congruent

In this problem

m∠A=m∠B ----> by vertical angles

we have

m∠A=x

m∠B=3x-60

substitute

$3x-60=x$

Solve for x

$3x-x=60$

$2x=60$

$x=30$

therefore

m∠A=30°

7 0

4 years ago

1. 4/8 in simplest form

Studentka2010 [4]

1. Divide both sides by 4 = 1/2
2. Divide both sides by 4 = 1/3
3. Divide both sides by 3 = 1/3
4. Divide both sides by 2 = 1/2
5. Divide both sides by 3 = 4/5

7 0

4 years ago