X= 4 6 12 help please
2 answers:
Answer:
The answer is x=12
Step-by-step explanation:
In order to determine the "x" value, we have to know about the tangent to a circle.
The line that joins two infinitely close points from a point on the circle is a Tangent. It means, the lines that intersect the circles exactly in one single point are tangents.
I have attached an image that shows a tangent to a circle. Also there is a formula that relates the segments of the circle.
According to the same notation of the image:
In this case:
Finally the answer is x=12
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Answer: 68
Step-by-step explanation:
Formula for sample size when prior estimate of population proportion (p) is available:
, where z*= critical-value.
E= Margin of error.
Let p be the population proportion of trees are infected with the citrus red mite.
As per given , we have
E= ± 0.08
The critical z-value corresponding to 90% confidence level = z*=1.645
Substitute all the values in the above formula , we get
Required sample size :
[Rounded to next integer.]
Thus, the minimum sample size should be taken =68