A ramp with a constant incline is made to connect a driveway to a front door. At a point 4 feet from the driveway, the height of
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Answer:
The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 7.2 - 3.35 = 3.85 years
The upper end of the interval is the sample mean added to M. So it is 7.2 + 3.35 = 10.55 years
The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.
we can see that
semicircle is cut off from a rectangle
Area of rectangle:
length =8
width =14
area =length*width
Area of semicircle:
diameter=8
so, radius =4
now, we can find resultant area
so, option-C..........Answer