The percentage of the students with mass less than 69kg is

M1a

6 years ago

%of students mass less than 69kg= addition of students less than 69kg/addition of all students
=28/49×100
=70%

M1a

6 years ago

%mass of students less than 69kg=4+5+11+8/4+5+11+8+7+5×100/1
%mass=70%