A school's administrators are concerned about absenteeism at their school
and the eect it has on students' grades. The following data were compiled, based on a sample of students.
Student's Absent Medium Absent
Grade Infrequently Absent Frequently
Low 1 9 8
Medium 6 35 7
High 8 9 2
a. What is the probability that a randomly selected student will have a low grade?
This would be 1/15 + 9/53 + 8/17 right?
b. What is the probability that a randomly selected student absent frequently?
8/18 + 7/48 + 2/19
c. Are grades and frequency in absent independent events? Why?
Not sure but i think they are dependent
d. Knowing that a randomly selected student has high grade, what is the probability that student is absent frequently?
e. What is the probability that a randomly selected student has either high grade or absent frequently?
I don't know how to calculate this
1. My school begins at 8:30 a.m. like Bora's school. 2. Our school begins at 8:30 a.m. like Bors'a school. (Which one is correct? Are both OK, my school and our school?) 3. My school and Bora's school are the same as follows.
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