Answer:
We need a sample size of at least 369.
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:
For this problem, we have that:
90% confidence level
So 
, z is the value of Z that has a pvalue of 
, so 
.
How large of a sample size is required?
We need a sample size of at least n.
n is found when 
. So
Rounding up
We need a sample size of at least 369.
Let, initial side is a.
When side is n times long, new side na.
Initial volume, 
Final volume, 
Change in volume, 
For, n = 2 :
n = 3 :
n = 10 :
Hence, this is the required solution.
The unit price is : 65.25/9 = 7,25 $
answer with an example is attached below
Answer:
wait if jackie can run 7 m/s then she already is the fastest
