What is the solution to 90 - 6 < 21?

Rodell wants to find the favorite gaming app among the students at his school. he decides to poll the thirty students on his football team and the fifteen students on his basketball team to gather the data. what is wrong with rodell’s method for collecting his data? a.rodell only polled male athletes; this sample does not represent the girls or nonathletes at the school. b.rodell needs a larger sample size than two sports teams to represent a whole school. c.rodell polled everyone on his teams; he should have only polled every other student for it to be a true sample. d.rodell’s polling method only included fall and winter sports; he should have also included a spring sport like baseball.