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
<span>2 + 13x, because (19x − 6x) + 2 = 13x + 2 = 2 + 13x</span>
Answer:
There are 50 boys
Step-by-step explanation:
girls to boys - 2:4
so 25x2=50
Area=rsquared(pi)
24/2=12(12)=144(pi)
Around 452.16
I hope that is correct.
Answer:
Step-by-step explanation:
23 - 100
5 - X
23x= 500
x=21%