Answer:
0.0594.
Step-by-step explanation:
The standard error of a proportion p, in a sample of size n, is given by:

In a sample of 62 horses with enteroliths, she finds 42 are fed two or more flakes of alfalfa.
This means that 
So


So the correct answer is:
0.0594.
The number of 2 bedroom apartments is 7.
($450*7)+($360*5)=$4950