The question asks the answer that comes out from the division of 3912.99 by 15.9. Both the numbers are in decimal form, so the division will be easy.
3912.99/15.9
= (391299 * 10)/(159 * 100)
= (391299)/(1590)
= 246.10
So the answer that comes out from the division of the two numbers given in the question is 246.10. I hope i have described the full process and it has helped you to understand the way these kind of problems need to be tackled.
First of all I want to point out you drew the diagram a little wrong. The Arc is 41 doesn't mean its 41 degrees it means it has length 41 so remove the degrees symbol.
Now for the answer the other arc have to have angle 40 too because vertical angles. And because the radius is the same, both of the length has formula 40/360*pi*2*radius which is 41 in this case. So x has to be 41 also :) Done!
43.586 rounded to the nearest 10th would be 43.6
You just have to look at the number to the right 43.5<u>8</u>
if the number is 5 or more then you round up, if it's lower then the number remains the same.
Hope this helps you :)<u />
Answer:
Step-by-step explanation:
Data given
represent the sample mean obtained
represent the sample deviation obtained
represent the true mean (variable of interest)
n=400 represent the sample size selected
Solution to the problem
The best estimator for the true mean 
is given by the sample mean 
, and the reason is: If we assume that in tha random sample 
each observation follows a normal distribution like this:
Then when we find the expected value for the sample mean we have this:
If we use the properties of the expected value we have:
And since the expected value of each observation is the same we have:
So then we have that the best estimator for the population mean is given by:
