Aschool has all of the students in grade 8 take a math test. several sample are taken from the results. which of the following samples is not likely to produce a representative sample of the population.
a. 35 students whose birthdays are in november
b. 40 students who did well on the math test
c. 45 students who have the same lunch period
d. 50 students whose first name start with m
( explain)