Which quadratic inequality does the graph below represent?

Mathematics

1 answer:

iVinArrow [24]3 years ago

5 0

Answer:

a) y = x**2 - 3

Step-by-step explanation:

Let x = 0, then y = -3 or anything above (the unshaded area), so "a" fits.

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For each pair solve of simultaneous equations solve for x and y x+y=13 and 8x-5y=0

vovangra [49]

Answer:

x=5 y=8

Step-by-step explanation:

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3 years ago

Determine mu Subscript x overbar and sigma Subscript x overbar from the given parameters of the population and the sample size.

pentagon [3]

Answer:

$\bar X= \mu = 25$

$\sigma_{\bar X}= \frac{7}{\sqrt{15}}= 1.807$

Step-by-step explanation:

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".

Solution to the problem

Let X the random variable that represent the variable of interest of a population, and for this case we know the following conditions

Where $\mu=25$ and $\sigma=7$

And for this case we select a sample size of n= 15. and we want to know the distribution for the sample mean $\bar X$ . We can assume that the distribution for $\bar X$ is approximately normal and given by: