The school board administered a math test to all students in grade 6 at high achievers charter school and determined that 15%, percent of them were below grade level in math.
based on this data, which of the following conclusions are valid?
choose 1

a
15%, percent of students in the sample are below grade level in math, but we cannot conclude anything about the students in grade 6 at hacs.

b
15%, percent of all students in grade 6 at hacs are below grade level in math.

c
15%, percent of all students at hacs are below grade level in math.