about 50% of the population of Alaska lives within a 50 mile radius of anchorage. if the total area of Alaska is 586,412 mi.² ab
2 answers:
So since it is a 50 mile radius around one point, then it makes a circle. You need to find the are of the circle to find out how much land that is. you use the equation A=
r². Plug 50 in for r and you get A= 50². 50²=2500. Then you multiply that by 3.14 (rounded number of pi) and you get 7850. So, now you have the total land area, now you need the percent of the total Alaskan land. To do that, you make a proportion. 
= 
Then, you cross multiply and get 785,000=586,412x. To find out what x is, you divide both sides by 586,412 and get x=1.3386 % . Hope this helps!!
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Answer:
The 90% confidence interval for the average bonus that all employees working for financial companies in New York City received last year is between $43,819 and $50,181
Step-by-step explanation:
We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.
T interval
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 62 - 1 = 61
90% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 61 degrees of freedom(y-axis) and a confidence level of . So we have T = 1.67
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 47000 - 3181 = $43,819
The upper end of the interval is the sample mean added to M. So it is 47000 + 3181 = $50,181
The 90% confidence interval for the average bonus that all employees working for financial companies in New York City received last year is between $43,819 and $50,181