a sample of 40 fourth grade students a sample of 20 heads of lettuce a sample of 200 students at a big-ten a sample of 20 items has mean 42 units a sample of 100cm3 of dilute h2so4 a sample of 100 dry battery cells tested a sample of 35 a sample of 100 wood and 100 graphite a sample of 100 cars driving on a freeway a sample of 35 observations has the mean 80 a sample of 3g containing na2co3 sample resignation letter with 30 days render