Answer:
Rational
Step-by-step explanation:
-9 is rational because 9 is a perfect square and all perfect squares are rational.
The formula for the sum<span> of the interior </span>angles of a polygon<span> is equal to (n-2)*180. the </span>polygon<span> has </span>12<span>sides, so the </span>sum<span> of the interior </span>angles<span> of the </span>polygonis equal to (12<span>-2)*180 = 10*180 = 1800 degrees.</span>
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:

3 because the middle of 2 and 4 is three so three is the midpoint