Answer:
6
Step-by-step explanation:
y=k*x
180=k*n
n=k*5
180=k*k*5. so k*k=36, k=6
Answer:
Area=144m²
Step-by-step explanation:
I hope you don't have any difficulty in understanding this answer
Answer:
Step-by-step explanation:
30/5= 6
Answer:
554 executives should be surveyed.
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Z-table as such z has a p-value of
.
That is z with a pvalue of
, so Z = 1.96.
Now, find the margin of error M as such

In which
is the standard deviation of the population and n is the size of the sample.
Standard deviation of 3 hours.
This means that 
The 95% level of confidence is to be used. How many executives should be surveyed?
n executives should be surveyed, and n is found with
. So






Rounding up:
554 executives should be surveyed.