Need help here. Don\'t know how to do the equation without thetotal number of st

Question

Need help here. Don't know how to do the equation without thetotal number of students. Help Please. A school contains students in grades 1, 2, 3, 4, 5, &6. Grades 2, 3, 4, 5 & 6 all contain the same number ofstudents. but there are twice this number in grade 1. If a student s selected at random from a list of all thestudents in the schook, what is the probability that she well be ingrade 3? Please help with showing how to figure this without the totaland with the possibility that the student is a she. Will rateasap. Thank You Need help here. Don't know how to do the equation without thetotal number of students. Help Please. A school contains students in grades 1, 2, 3, 4, 5, &6. Grades 2, 3, 4, 5 & 6 all contain the same number ofstudents. but there are twice this number in grade 1. If a student s selected at random from a list of all thestudents in the schook, what is the probability that she well be ingrade 3? Please help with showing how to figure this without the totaland with the possibility that the student is a she. Will rateasap. Thank You

Explanation / Answer

First: Let X represent the number of students in each classwith 2X being the number in the first grade: Grade:    1    2    3 4   5   6 Number of students:       2X   X   X   X X X   =   7X total students Number of students in 3rd grade: X Probability = (Number of students in 3rd grade)/(Total students) =X/7X = 1/7 The probability that this student is female is about 1/2. The probability that this student is both female and in the 3rdgrade is: 1/7 * 1/2 = 1/14 Hope this helps!

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