Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand Mathematics and Statistics Program ,Faculty of Science and Technology  ,Sakolnakhon Rajabhat University, Thailand