An experiment consists of rolling a standard number cube. Use the results in the table to find the experimental probability of each event.
Can someone help me with these questions, or explain how to do them?

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form

What is the interquartile range of this day at set?