Tuesday
March 3, 2015

Homework Help: probabilityv

Posted by lisa on Saturday, October 16, 2010 at 2:17am.

A school's administrators are concerned about absenteeism at their school
and the e ect 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?
2/19
e. What is the probability that a randomly selected student has either high grade or absent frequently?
I dont know how to calculate this

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Check answers please Statistics - Suppose that each student in stat. has a 9% ...
Math Help - Suppose that each student in stat. has a 9% chance of missing class...
math - suppose 8 out of every 20 students are absent from school less than 5 ...
Math - Suppose 8 out of every 20 students are absent from school less than 5 ...
math - Suppose 8 out of every 20 students are absent from school less than five ...
Math - Suppose 8 out of every 20 students are absent from school less than five ...
math - Attendance records at a school show the number of days each student was ...
math - there are 13 boys and 14 girls in mrs greens class if 3 of the students ...
math - 5th grade class of 16 students, one-half of the student arrived at school...
college math - 15. Records at a high school indicate that each year for the past...

Members