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janessa0804
08.04.2020 •
Mathematics
12. Monthly electric bills for all households in a city have a skewed probability distribution with mean $90 and standard deviation $25. A simple random sample of 75 households is taken. (a) What is the approximate shape of the distribution of sample means?
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Ответ:
From the central limit theorem (n>30) we know that the distribution for the sample mean
is given by:
With:
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 heights of a population, and for this case we know the following properties for X
Where
and ![\sigma=25](/tpl/images/0588/8088/5fb70.png)
From the central limit theorem (n>30) we know that the distribution for the sample mean
is given by:
With:
Ответ:
option B: III , 7pi/18
Step-by-step explanation:
Given angle is![\frac{-11\pi}{18}](/tpl/images/0013/4744/46d00.png)
Given angle is negative , so we add 2pi
Take common denominator 18
pi is 180 degree. Lets find degree for this radians
25 * 180 / 18 = 250 degree
250 degree lies in third quadrant (III)
Now we find reference angle
to find the reference angle for the angle in third quadrant we subtract 180
250 - 180 = 70 degree
now convert it into radians