In an examination 80 student secured first class mark in English or mathematics out of thise 50 student obtained first class mark in mathematics and 10 in English and mathematics both how many students have secured first class mark in English only?

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: