No, because she only has $11.23 left.
Answer:
n=3.8416≅4
So Minimum Sample Size is 4
Step-by-step explanation:
In order to find the minimum sample size, the formula we use will be:

Where:
n is sample size
Z is the distribution
S is the standard deviation
E is the Margin of error
S=3 ,E=3
For Z:
Alpha=1-0.95=0.05
Alpha/2=0.025=2.5%
From Cumulative Standard Distribution Table:
Z at Alpha/2 = 1.960

n=3.8416≅4
So Minimum Sample Size is 4
The area of a square of side s is
.. A = s^2
The area of a circle of diameter s is
.. A = (π/4)s^2
The area of the yellow region is the difference between these when s=5 ft, so is
.. (5 ft)^2*(1 -π/4) ≈ 5.4 ft^2