Charles Aronu Department of Statistics, Chukwuemeka Odumegwu Ojukwu University, Uli, Anambra State, Nigeria Nigeria
A. O. Bilesanmi Department of General Studies, Petroleum Training Institute, Effurun-Delta State, Nigeria Nigeria
R. B. Agbogidi Mathematics Units, School of Basic Science, Nigeria Maritime University, Okerenkoko, Delta State, Nigeria Nigeria