2. In the diagram, m_XYZ = 115 • and mZWXY = 450
1 answer:
You might be interested in
Answer:
18+
Step-by-step explanation:
Since the helicopter flies east for six miles and north for 12 miles, it flies 18 miles. Then on the way back, it flies an unknown amount of miles. the path the helicopter takes is in the form of a triangle, and the path back is the hypotenuse of the triangle. To find the hypotenuse, we can do , where c is the hypotenuse. We do
Therefore, the total distance flown by the helicopter is 18+
.
Answer:
We need a sample size of at least 271
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
90% confidence level
So , z is the value of Z that has a pvalue of
, so
.
How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 5%
We need a sample size of at least n, in which n is found when
We do not know the true proportion, so we use , which is when we are going to need to use the largest sample size.
Rounding up
We need a sample size of at least 271