About the Authors

Khalidur Rahman

khalid_sust@yahoo.com

Affiliations Mathematics Section, School of Distance Education, Universiti Sains Malaysia, Penang, Malaysia, Department of Statistics, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh

Noraida Abdul Ghani

Affiliation Mathematics Section, School of Distance Education, Universiti Sains Malaysia, Penang, Malaysia

Anton Abdulbasah Kamil

Affiliation Mathematics Section, School of Distance Education, Universiti Sains Malaysia, Penang, Malaysia

Adli Mustafa

Affiliation School of Mathematical Sciences, Universiti Sains Malaysia, Penang, Malaysia

Md. Ahmed Kabir Chowdhury

Affiliations School of Mathematical Sciences, Universiti Sains Malaysia, Penang, Malaysia, Department of Statistics, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KR NAG AAK AM MAKC. Performed the experiments: KR NAG AAK AM MAKC. Analyzed the data: KR NAG AAK AM MAKC. Contributed reagents/materials/analysis tools: KR NAG AAK AM MAKC. Wrote the paper: KR NAG AAK AM MAKC.