please solve and explain

The following scenario applies to questions 1-3: We sometimes hear that marriage is good for your career, An SRS of 8235 male managers and professionals employed by a large manufacturing firm were asked their marital status (married, single, widowed, or divorced) and their job title. (To avoid gender effects, the investigators looked only at men.) The researchers categorized their jobs into one of four job grades (1, 2, 3, or 4). Grade 1 contains the jobs in the lowest quarter of the job grades, and Grade 4 contains those in the highest quarter. Their results are contained in the following Marital Status Single Married Divorced Widowed Total 58 874 15 8 955 2 222 3927 70 20 4239 Job Grade 3 50 2396 34 10 2490 4 7 533 7 4 551 Total 337 7730 126 42 8235 1. What proportion of Job Grade 1 who were surveyed said that they are Married? 2. What proportion of the "single" respondents have Job Grade 3? What proportion of those who were Divorced were in job grade 2? A university official wants to determine if a relationship exists between whether college students choose their majors before their junior year and whether they graduate from college. 1. For this study, what is the response variable? " A. The number of students in the study who decide on their major before their junior year " B.Whether a student decides on his/her major before their junior year CC. How likely a student is to graduate from college " D.Whether a student graduates from college 2. What is the role - type classification of the variables in this study? AC-->Q B. C-->C