Cellulitis is an infection of the skin. It is caused when bacteria living on the skin surface enter through a cut in the skin. This results in swelling and redness of the infected area. The images show a patient with cellulitis in one leg and one of the types of skin bacteria that cause cellulitis. (Source: © Louis Lau / Alamy Stock Photo) bacteria The antibiotic flucloxacillin is the current treatment for cellulitis. A student investigated the antimicrobial properties of flucloxacillin. An agar plate had the type of bacteria which causes cellulitis spread over the surface of the agar. Three discs containing the same concentration of flucloxacillin were placed onto the plate, as shown in the diagram. The plates were incubated for 24 hours at $$\(25^{\circ} \mathrm{C}\)$$. The table shows the student's results. Standard deviation can be calculated by using the formula: The table shows some of the calculations done by the student. Which of the following explains why the student would want to calculate the standard deviation(s) (SD) for this experiment? (1)

Answer:

Knowledge points:

Solution: