Answer:
The formulas are functionally the same, but 'n' (the sample size) is used instead of 'N' (the population size).
Step-by-step explanation:
The sample mean is the average value for a set of observations which is derived from a population. While the population mean is the average value for the entire set of observation belonging to a particular study of interest.
The set of observation belonging to a population is denoted by 'N' ; while the sample size is denoted as 'n' :
The mean formula is written thus :
Population mean = Σx / N
Sample mean = Σx / n
Where, x = set of values.
Answer:
,
, 
Step-by-step explanation:
The perimeter covered by the electric fence in meters is:

The area of the rectangle is:


Let differentiate the previous equation and equates to zero:

The critical point is:

By the Second Derivative Text, it is proved that critical point lead to a maximum:

The other side of the rectangle is:

The largest area than can be enclosed is:


The dimensions of the triangle are:


Your answer is c lmk if I’m wrong