Kris wanted to understand whether students at her school were in favor of an extended school day. she surveyed some students and displayed the results in the table below: in favor opposed undecided grade 9 6 4 8 grade 10 10 11 9 grade 11 12 15 11 grade 12 15 6 14 if the principal randomly selects a student in grade 10 from this survey, what is the probability that the student is opposed to extending the school day?

the table below:

Grade        In favor  OpposedUndecided    Total

Grade 9     6                   4                       8                18

Grade 10     10        11                        9                30

Grade 11     12        15                      11                  38

Grade 12     15        6                      14                  35

If the principal randomly selects a student in grade 10 from this survey,

the probability that the student is opposed to extending the school day

P ( student in grade 10 is opposed)= Number of student in opposed(grade10) / total number of students in grade 10

Number of student opposed who is in grade10 = 11

total number of students in grade 10 = 30

P( student in grade 10 is opposed)=  

= 0.37

the probability that the student is opposed to extending the school day= 0.37

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a