The diameter of a circle Is 8 inches . What is the area ?
2 answers:
Hello There!
is here to help you!
We are given that
d=8 in.
We know that the radius is 1/2 of d or r=d/2. So the radius is 4.
However, we have to find the area.
The formula for the area of a circle is:
A=
We know that r=4, so all we have to do is plug it into the formula:
A=
Remember that only the radius is squared.
A=
A=50.265
Let's round to the nearest tenth:
A=50.3
Hope this helps you!
Let me know if you have any questions!
You might be interested in
Answer:
And using the normal standard table or excel we find the probability:
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 avergae number of weeks an individual is unemployed of a population, and for this case we know the distribution for X is given by:
Where and
Since the distribution for X is normal then, the distribution for the sample mean is given by:
We select a sample of n =50 people. And we want to find the following probability
And using the normal standard table or excel we find the probability: