Your professor's daughter was born with a slightly misshapen head, so she gets to wear a helmet for a few months to correct it. You do a study of how many weeks babies have to wear a helmet to correct a flat head. You find that, in a sample of 200 babies, 49 of them need to wear the helmet for 1-5 weeks, 68 wear the helmet for 6-10 weeks, 53 wear the helmet for 11-15 weeks and the remaining 30 babies wear the helmet for 16-20 weeks. For this study, the relative frequency of babies that wear the helmet for 6-10 weeks is equal to

Your professor's daughter was born with a slightly misshapen head, so she gets to wear a helmet for a few months to correct it. You do a study of how many weeks babies have to wear a helmet to correct a flat head. You find that, in a sample of 200 babies, 49 of them need to wear the helmet for 1-5 weeks, 68 wear the helmet for 6-10 weeks, 53 wear the helmet for 11-15 weeks and the remaining 30 babies wear the helmet for 16-20 weeks. For this study, the relative frequency of babies that wear the helmet for 6-10 weeks is equal to

(200-68)/200 = 0.66

(49 + 68)/200 = 0.59

(68 + 53 + 30)/200 = 0.76

68/200 = 0.34