A survey of 2,500 students was conducted to find out if they prefer hamburgers or pizza. The results are shown in the table below.
1.) Find the probability of a student in the survey preferring burgers, given that they are in 9th grade, P (burgers | 9th grader) =
2.) Find the probability of a student in the survey preferring burgers or being in 10th grade, P (burgers or 10th grader) =
3.) Find the probability of a student in the survey being in 9th grade and preferring pizza, P (9th grader and pizza) =
4.) Based on the survey data, is being a 10th grade student independent of preferring pizza? Justify your answer.
