Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY)… Click to show full abstract
Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 Department of Statistics, University of Venda, Private Bag X5050, Thohoyandou 0950, South Africa; [email protected] (E.C.); [email protected] (A.B.) 2 Department of Applied Mathematics, Midlands State University, Private Bag 9055, Senga, Gweru 0054, Zimbabwe * Correspondence: [email protected]; Tel.: +27-15-962-8135 † These authors contributed equally to this work.
               
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