Number of Patients Receiving Treatment Z per Month 45 40- 235- 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec For which of the following three-month periods was the number of patients receiving the treatment in the middle month less than the average (arithmetic mean) number of patients receiving the treatment per month for the three-month period? OFebruary, March, April May, June, July O June, July, August August, September, October October, November, December Number of Patients 50 -50 45 40 35 0