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Kamila [148]
3 years ago
8

Algebra 2! Please help ASAP

Mathematics
1 answer:
sweet [91]3 years ago
6 0

the first box = Rational

the answers are the second 2 boxes

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The results of a common standardized test used in psychology research is designed so that the population mean is 145 and the sta
anygoal [31]

The value 155 is zero standard deviations from the mean, because x = μ , and therefore z = 0.

<h3>What is Standard Deviation?</h3>

The standard deviation is a measure of the amount of variation or dispersion of a set of values.

The key concept we need to manage here is the z-scores , and we can obtain a z-score using the next formula:

z = (x - μ)/σ      ..............[1]

Where

z is the z-score.

x is the raw score: an observation from the normally distributed data that we want standardize using [1].

μ is the population mean.

σ is the population standard deviation.

These standardized values have always the same probability in the standard normal distribution, and this is the advantage of using it for calculating probabilities for normally distributed data.

A subject earns a score of 155.

From the question, we know that:

x = 155.

μ = 155

σ = 50

Having into account all the previous information, we can say that the raw score, x = 155, is zero standard deviations units from the mean. The subject earned a score that equals the population mean. Then, using [1]:

z = (x - μ)/σ

z = (155 - 155) / 50

z = 0/50

z = 0

As we say before, the z-score "tells us" the distance from the population mean, and in this case this value equals zero:  

x = μ

Therefore, z = 0

So, the value 155 is zero standard deviations from the [population] mean.

Learn more about Standard Deviation from:

brainly.com/question/13905583

#SPJ1

8 0
2 years ago
Which exponential function has a growth factor of ?
ludmilkaskok [199]
Letter B would be the correct answer
8 0
3 years ago
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A population grew from 100,000 in 1990 to 124.000 in 2000. What was the percent of increase?
forsale [732]

Answer:

24%

Step-by-step explanation:

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2 years ago
Gertie ran 3/4 mile during physical education class. Sarah ran 2/4 mile during the same class. How much farther did Gertie run t
Marizza181 [45]
Gertie   3/4 mile.

Sarah    2/4 mile.

Gertie ran farther by:   3/4  -  2/4  =  (3 -2)/4  = 1/4

Gertie ran farther by 1/4 mile.

6 0
3 years ago
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The graph of the line x=-4 is a horizontal line
natita [175]

Answer:

Yes

Step-by-step explanation:

5 0
2 years ago
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