Determine the domain and range of the given function.

Mathematics

2 answers:

Nina [5.8K]2 years ago

4 0

Using function concepts, it is found that:

The domain of the function is all real numbers.
The range of the function is all real numbers greater than or equal to -2.

The domain of a function is the set that contains all possible input values. In a graph, it is the values assumed by the x-axis.

In this graph, x assumes all values from negative infinity to positive infinity, thus the domain is all real numbers.

The range of a function is the set that contains all possible input values. In a graph, it is the values assumed by the y-axis.

In this graph, y assumes values from -2 to positive infinity, thus the range is all real numbers greater than or equal to -2.

A similar problem is given at brainly.com/question/2145599

myrzilka [38]2 years ago

3 0

 here is your answer refer to the attachment

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zavuch27 [327]

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The bottom for an A is 75. Round to the nearest whole number as needed.

Step-by-step explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Let X the random variable that represent the scores on this case, and for this case we know the distribution for X is given by:

$X \sim N(\mu=73,\sigma=7)$

And let $\bar X$ represent the sample mean, the distribution for the sample mean is given by:

$\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})$

2) The bottom for an A is _____. Round to the nearest whole number as needed.

And we want the top 5.5% of the scores, so we need a value a such that:

$P(X>a)=0.055$ or $P(X$

We need on the right tail of the distribution a value a that gives to us 94.5% of the area below and 5.5% of the area above. Both conditions are equivalent.

Let's use the condition $P(X$ , the best way to solve this problem is using the z score with the following formula:

$z=\frac{x-\mu}{\sigma}$

So we need a value from the normal standard distribution that accumulates 0.945 of the area on the left and 0.055 on the right. This value on this case is 1.598 and we can founded with the following code in excel:

"=NORM.INV(0.945,0,1)"

If we apply the z score formula to our case we have this:

$P(X$