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2 answers:
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Answer:
And we can find the following probability:
And the last probability can be founded using the normal standard distribution or excel.
Step-by-step explanation:
For this case we define the random variable X as the ages of vehicles. We know the following info for this variable:
represent the mean
represent the deviation in years
They select a sample size of n=40>30. And they want to find this probability:
Since the sample size is large enough we can use the central limit theorem and the distribution for the sample mean would be:
We can use the z score formula given by:
And if we find the z score for 4 we got:
And we can find the following probability:
And the last probability can be founded using the normal standard distribution or excel.
For this case we have that by definition the area of a rectangle is given by:
Where
- <em>w: width of the rectangle </em>
- <em>l: length of the rectangle </em>
The area of the original rectangle is given by:
The area of the new rectangle is given by:
Therefore, the original area increases with a factor of 9.
Anwer:
the original area increases by a factor of 9.