Answer:
The amount of medication to be applied is approximately 7.87 inches
Step-by-step explanation:
The given parameters are;
The length of the incision the patient has = 20 cm
The length of the application of the antibiotic = The length of the incision the patient has
∴ The length of the application of the antibiotic = 20 cm
The amount of medication to be applied = 20 cm = 7.874016 inches ≈ 7.87 inches
The plot of the PDF shows the distribution is symmetric. This means that the mean is the same as the median, and that the 50% of the distribution lies to other side of this mean, i.e.

For this distribution,
.
Answer and Step-by-step explanation:

Decreased by 20%