Answer: 18
Step-by-step explanation:
The formula to find the minimum sample size is given by :_
, where 
= population standard deviation.
z*= critical z-value.
E= Margin of error.
Given : 
E= ± 8
We know that critical value corresponding to 99% confidence level = z*=2.576 [Using z-table]
Then, the required sample size would be :
[Round to next integer.]
Hence, the required minimum sample size = 18
This is the answer for the question
Answer:
112 degrees.
Step-by-step explanation:
- as we know that the three set of forces will form a triangle, by using cosine rule, we can find the required angle.
- follow the diagram in the attachment.
- by cosine rule for
,
2*10*8*cos = 
now, dividing both sides by 2*10*8,
cos = -61/160
= 112.4 degrees = 112 ( appox) ( use calculator for this cos inverse function)
$10 dollars because she made 5 dollars in 30 minutes so you would take it times 2
